Galena rocks

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3. Galena. Uses Serves as an ore in most of the world’s lead production. What our geology experts say about Galena “Galena is a lead sulfide mineral with a chemical composition of PbS. It has a perfect cleavage 90 degrees, and has a distinct silver color and a bright metallic luster. It resembles the “Mother Boxes” of the Justice League ...Base on type of host rock, mineralization and properties of galena mineral, Kalatepiale prospect area is similar to Mississippi valley-type deposits. Discover the world's research 25+ million members212 Items ($1 to $495) 3.4" Glassy Yellow Anglesite Crystals on Galena - Morocco. $495. 6.5" Glassy Anglesite and Cerussite Crystals on Galena -Morocco. $395. 1.8" Glassy Yellow Anglesite Crystals on Galena - Morocco. $145. 1.9" Glassy Yellow Anglesite Crystals on Galena - Morocco. $125. galena, also called lead glance, a gray lead sulfide (PbS), the chief ore mineral of lead.One of the most widely distributed sulfide minerals, it occurs in many different types of deposits, often in metalliferous veins, as at Broken Hill, Australia; Coeur d'Alene, Idaho, U.S.; Clausthal Zellerfeld, Ger.; and Cornwall, Eng. Large deposits also occur as replacements of limestone or dolomite (e ...Smoothing. If the aquifer is in a stone layer — not a sand, clay, loam, or silt layer — you can instead choose to Smooth the walls (and the floor if you want) with v. Select Smoothing with m ...

Multi colored rounded river rocks for landscaping Lava rock prices. Lava rock costs $80 to $240 per ton or $50 to $180 per cubic yard, depending on the location and color.Lava rock prices are $20 to $50 per 10- to 50-lb. bag. Lava rock is known as "scoria" and comes in red, black, and grey colors. Lava rock prices per ton and per yard - chartThis article will dive deeper into the many great rockhounding sites across the state (along with maps), but I’d like to highlight a few standouts here. The top 10 rockhounding sites for rocks and minerals in Kansas: Smoky Hill River – Moss Agate, Chalk. Topeka – Lake Superior Agates. Geary County – Agatized wood.Dendritic copper specimens are a popular rock-shop item. Galena . Moha El-Jaw/Getty Images. Galena has a silver color with a dark-gray streak. Galena has a hardness of 2.5 and a very heavy weight. Gold Nugget . PIX1861/Pixabay. Gold has a golden color and streak, with a hardness of 2.5 to 3. Gold is very heavy.Galena is lead sulfide with a hardness of 2.5 on the Moh's scale - actually quite soft- but it is VERY heavy with a specific gravity of 7.4 to 7.6. To put that in perspective, it weighs about 700 pounds per cubic foot! Although lead is by far the most reclaimed industrial metal in the world, demand for it continues to outstrip the supply.Galena forms in low- and medium-temperature ore veins, along with other sulfide minerals, carbonate minerals, and quartz. These can be found in igneous or sedimentary rocks. It often contains silver as an impurity, and silver is an important byproduct of the lead industry.The most common and widespread lead mineral, galena occurs in low-temperature to medium-temperature hydrothermal veins in igneous rocks, pegmatites, and contact-metamorphosed sedimentary rock.Aug 17, 2023 · Most of these rocks fall into just six major types: limestones, dolostones, cherts, sandstones, siltstones, and shales. A few conglomerates, breccias, and other types may occur in limited places. Few rock layers are pure, so many mixtures and combinations of these types will be found, such as shaly limestones or dolomitic sandstones. Welcome the season of Autumn with themed crafts and a warm drink in the cozy Rock Hall branch. Space is limited, please register. More information. Good morning HomePorts! ... Galena: Millington: Rock Hall . Government Center. 400 High St. Chestertown, MD 21620 410-778-4600

Faith and business don’t always go hand in hand. But Rock of Wisdom Apparel brings faith and business together. Faith and business don’t always go hand in hand. But they do for Rock of Wisdom Apparel. The company started with a prayer and n...Figure 10d-4: Pyrite. Figure 10d-5: Galena. The Halides are a group of minerals whose principle chemical constituents are fluorine, chlorine, iodine, and bromine. Many of them are very soluble in water. Halides also tend to have a highly ordered molecular structure and a high degree of symmetry.Multi colored rounded river rocks for landscaping Lava rock prices. Lava rock costs $80 to $240 per ton or $50 to $180 per cubic yard, depending on the location and color.Lava rock prices are $20 to $50 per 10- to 50-lb. bag. Lava rock is known as "scoria" and comes in red, black, and grey colors. Lava rock prices per ton and per yard - chartGalena is a common and popular mineral for rock hounds. Its characteristic cubes, distinctive cleavage and high density make it easy to identify and a favorite in high school geology labs. The structure of Galena is identical to that of halite, NaCl.However, like galena, the elements in cinnabar are bonded together – inorganic mercury sulfide is virtually insoluble. Another risk we should discuss is reactions instigated by heat. Like many minerals, cinnabar can decompose thermally, meaning that if you were to cook it at a sufficiently high heat, it will break down and may release toxic ...

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: Get the latest Rock Field stock price and detailed information including news, historical charts and realtime prices. Indices Commodities Currencies StocksSource. Galena. This article will dive deeper into the many great rockhounding sites across the state (along with maps), but I’d like to highlight a few standouts here. The top 10 rockhounding sites for rocks and minerals in Missouri: Fox City – Geodes on north bank of the river. Grand River – Lake Superior Agates. The most significant chalcopyrite deposits to be mined are hydrothermal in origin. In these, some chalcopyrite occurs in veins and some replaces country rock. Associated ore minerals include pyrite, sphalerite, bornite, galena, and chalcocite. Chalcopyrite serves as the copper source for many secondary mineral deposits.Galena, or lead sulfide, the world’s major source of lead ore, occurs worldwide; and, it is mined in many countries, including the United States, Australia and China. Lead is one of the earliest metals exploited by man because of its low me...What is Galena? Galena is a lead sulfide mineral with a chemical composition of PbS. It is the world's primary ore of lead and is mined from a large number of deposits in many countries. It is found in igneous and metamorphic rocks in medium- to low-temperature hydrothermal veins.

Step 1. Determine if your specimen is an artifact, a fossil, a rock, or a mineral. Let's start with the basics. The first thing to do is to determine if your specimen is an artifact, a fossil, ... However, the streak of most minerals is similar in color to that of the mineral in hand-sample (see the example of galena pictured below).Base on type of host rock, mineralization and properties of galena mineral, Kalatepiale prospect area is similar to Mississippi valley-type deposits. Discover the world's research 25+ million membersGalena is a common and popular mineral for rock hounds. Its characteristic cubes, distinctive cleavage and high density make it easy to identify and a favorite in high school geology labs. The structure of Galena is identical to that of halite, NaCl. The two minerals have the same crystal shapes, symmetry and cleavage. This Rocks & Geodes item is sold by SFmineralsBG. Ships from Bulgaria. Listed on Oct 18, 2023Missouri State Mineral: Galena. Galena is the primary ore mineral of Lead. Worked for its lead content as early as 3000BC, it is found in ore veins with Sphalerite, Pyrite and/or Chalcopyrite, and in Sedimentary rocks as beds or impregmentations. The crystals are bright when fresh but often receive a dull tarnish after exposure to air.The study of rocks is known as geology. Scientists who study rocks are known as geologists. There are several subdivisions of geology, with different designations for researchers who study the individual disciplines.212 Items ($1 to $495) 3.4" Glassy Yellow Anglesite Crystals on Galena - Morocco. $495. 6.5" Glassy Anglesite and Cerussite Crystals on Galena -Morocco. $395. 1.8" Glassy Yellow Anglesite Crystals on Galena - Morocco. $145. 1.9" Glassy Yellow Anglesite Crystals on Galena - Morocco. $125.Oct 2, 2023 · galena: [noun] a bluish-gray cubic mineral with metallic luster consisting of lead sulfide and constituting the principal ore of lead. Multi colored rounded river rocks for landscaping Lava rock prices. Lava rock costs $80 to $240 per ton or $50 to $180 per cubic yard, depending on the location and color.Lava rock prices are $20 to $50 per 10- to 50-lb. bag. Lava rock is known as "scoria" and comes in red, black, and grey colors. Lava rock prices per ton and per yard - chartMinerals and Gemstones Found In Wisconsin. 1. Sphalerite. Sphalerite is the primary ore of zinc, taking the form of cubic crystals of zinc sulfide. It’s a common find in areas that previously had hydrothermal vents in the past, and it’s a good indication that other related minerals are nearby.Rocks are important because geologists use evidence from them to learn about what the Earth was like in the past. They allow scientists to build a historical record of the planet to learn what events occurred before people lived.

All rocks except obsidian and coal are made of minerals. (Obsidian is a volcanic rock made of glass and coal is made of organic carbon.) Most rocks contain several minerals in a mixture characteristic of the particular rock type. When identifying a rock you must first identify the individual minerals that make up that rock.

Galena is also found near Pleasanton, Linn County, and has been reported from Chautauqua, Douglas, Elk, and Sumner counties and in rock fragments brought to the surface during drilling for oil in many other counties. Galena from Tri-State District of Southeastern Kansas. Sphalerite (hardness 3 1/2-4) Galena containing bismuth may exhibit octahedral cleavage, and silver in Galena may cause a specimen to exhibit flaky, slightly bent cleavage fragments. Galena ...Humans use rocks for a wide variety of purposes, including construction and as a source of valuable minerals located inside the rocks. Additionally, humans use rocks for decoration, recreation and thermal purposes.Galena Meanings, Zodiacs, Planets, Elements, Colors, Chakras, and more. Science & Origin of GalenaGalena is a lead sulfide mineral that crystallizes in the form of masses, cubes, octahedrons, and fibrous layers. Today, it's the most important lead ore when it comes to the production of goods. This mineral was first described back in 77 A.D. by Gaius Plinius Secundus (Pliny the Elder). He named ...Check out our galena stone selection for the very best in unique or custom, handmade pieces from our metaphysical crystals shops.Galena: Ore of Lead. Hematite: Ore of Iron. Graphite: Dry Lubricant. Sphalerite: Ore of Zinc. Gypsum: Dry Wall. Calcite: Marble, cement. Study with Quizlet and memorize flashcards containing terms like List the five characteristics an Earth material must have in order to be considered a mineral., Use the geologic definition of a mineral to ...Located in northwest Illinois, visitors to Galena enjoy eye-catching architecture and a deep history that could be why the city welcomes about a million of them a year. Galena is rich in local history. Ulysses S. Grant found his way to Gale...Browse Kent County News obituaries, conduct other obituary searches, offer condolences/tributes, send flowers or create an online memorial.Bid now on Invaluable: GALENA ROCK STONE LAPIDARY SPECIMEN from Col. Christie Hatman, Auctioneer on October 30, 2023, 01:00 PM CST.Rocks (50%) Sampl e Rock Group Rock subdivision Major minerals/Characteristics Rock Name Personal note Igneous Intrusive Quarts/ large minerals ... Galena Metallic Luster, shiny looking Mohs scale 3 - 4 (Not scratch with fingernail(2), but scratch with wire nail (4)) Potassium Feldspar (K-feldspar)

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The MEC Mineral Baby details the estimated amount of minerals, metals and fuels that an American born this year will use in their lifetime. In 2023, this amount is 3.07 million pounds. This is calculated with statistics from the National Mining Association and the U.S. Geological Survey (USGS), in combination with life expectancy data from the ...View local obituaries in Kent County, Maryland. Send flowers, find service dates or offer condolences for the lives we have lost in Kent County, Maryland.If you’re a fan of fashion and want to rock the latest styles, look no further than Torrid’s online store. With their wide selection of trendy apparel and accessories, you can easily find something to fit your style.Are you a Plymouth Rock customer? If so, you may be missing out on valuable benefits by not logging into your account. In today’s digital age, convenience and accessibility are key, and creating an account with Plymouth Rock can provide you...Galena - Mindat.org - Mines, Minerals and More Sphalerite (sometimes spelled sphaelerite) is a sulfide mineral with the chemical formula (Zn,Fe)S. It is the most important ore of zinc.Sphalerite is found in a variety of deposit types, but it is primarily in sedimentary exhalative, Mississippi-Valley type, and volcanogenic massive sulfide deposits. It is found in association with galena, chalcopyrite, pyrite (and other sulfides), calcite ...Pb isotopic compositions of the Korsnäs galena plot with the rest of the galena from Svecofennian supracrustal rocks studied by Vaasjoki (1981). Taken together, these data strongly suggest the carbonate is derived from crustal sources, probably hydrothermal in origin, and is not a carbonatite, sensu stricto ( Mitchell, 2005 ). Don't spend too much time on evaluating luster of rock samples. Make sure you observe other properties (e.g., hardness, streak, cleavage, etc.) Here are some examples of luster in rocks (multi-crystalline aggregates) where crystals approach microscopic in size, making luster more difficult to evaluate. Metallic luster - single crystal of graphite.However, like galena, the elements in cinnabar are bonded together – inorganic mercury sulfide is virtually insoluble. Another risk we should discuss is reactions instigated by heat. Like many minerals, cinnabar can decompose thermally, meaning that if you were to cook it at a sufficiently high heat, it will break down and may release toxic ...Galena containing bismuth may exhibit octahedral cleavage, and silver in Galena may cause a specimen to exhibit flaky, slightly bent cleavage fragments. Galena ... ….

Silver Metallic Luster in Galena: This photograph shows the silver metallic luster of a nice cubic crystal of galena. The galena crystal is about two inches on a side, and the adjacent white crystals are calcite. ... An octahedral diamond crystal in positive relief on the surface of its host rock. Adamantine is the highest level of luster. This ...This article will dive deeper into the many great rockhounding sites across the state (along with maps), but I’d like to highlight a few standouts here. The top 10 rockhounding sites for rocks and minerals in Kansas: Smoky Hill River – Moss Agate, Chalk. Topeka – Lake Superior Agates. Geary County – Agatized wood.About 30 miles southeast of Galena, the 2,500-acre park caters to picnickers, campers and hikers. Fifteen miles of trails lead to overlooks of the Mississippi, rock formations and wooded ravines. Kayaking the Galena River. Galena River | Credit: John Noltner. Nuts Outdoors .Geodes. Bonner Springs. 39.070760, -94.869953. Geodes. Showing 1 to 7 of 7 entries. The Blue Hills in Kansas is a great spot for rockhounds looking to find septarian nodules. These sedimentary nodules have brown calcite and an Aragonite shell filled with yellow-brown calcite. Picture of set of natural rocks and stones - tourmaline dravite, talc, azurite, galena, iceland spar, cuprite, amazonite, magnesite, gneiss, quartz, flint, marble gem stones isolated on white background stock photo, images and stock photography. Image 51468107.Pb isotopic compositions of the Korsnäs galena plot with the rest of the galena from Svecofennian supracrustal rocks studied by Vaasjoki (1981). Taken together, these data strongly suggest the carbonate is derived from crustal sources, probably hydrothermal in origin, and is not a carbonatite, sensu stricto (Mitchell, 2005).21438 East Sharp Street, Rock Hall 21661, Maryland (410) 639-7900. Website; Close map(X) Map Location. Map Directions Business Details. Type: Hospitality Categories: ... Galena: Millington: Rock Hall . Government Center. 400 High St. Chestertown, MD 21620 410-778-4600 [email protected]'t spend too much time on evaluating luster of rock samples. Make sure you observe other properties (e.g., hardness, streak, cleavage, etc.) Here are some examples of luster in rocks (multi-crystalline aggregates) where crystals approach microscopic in size, making luster more difficult to evaluate. Metallic luster - single crystal of graphite.Galena mineral/Lead-zinc ore price: The price of Galena depends on its silver and lead amount. The lead is worth 1, 720 USD in one ton of galena. The silver is worth 7, 292 USD. The price of lead-zinc ore is 2, 300 USD per ton and you can read Market Insider for the latest lead price.A wide variety of rocks, minerals, and gemstones can be found in Wisconsin including agate, jasper, diamond, aventurine, native copper, kyanite, pearls, galena, and quartz crystals. Wisconsin contains many gem-quality mineral specimens as well as crinoid and trilobite fossils. Galena rocks, 21438 East Sharp Street, Rock Hall 21661, Maryland (410) 639-7900. Website; Close map(X) Map Location. Map Directions Business Details. Type: Hospitality Categories: ... Galena: Millington: Rock Hall . Government Center. 400 High St. Chestertown, MD 21620 410-778-4600 [email protected], 3. Galena. Uses Serves as an ore in most of the world’s lead production. What our geology experts say about Galena “Galena is a lead sulfide mineral with a chemical composition of PbS. It has a perfect cleavage 90 degrees, and has a distinct silver color and a bright metallic luster. It resembles the “Mother Boxes” of the Justice League ..., Oct 2, 2023 · galena: [noun] a bluish-gray cubic mineral with metallic luster consisting of lead sulfide and constituting the principal ore of lead. , Rocks (50%) Sampl e Rock Group Rock subdivision Major minerals/Characteristics Rock Name Personal note Igneous Intrusive Quarts/ large minerals ... Galena Metallic Luster, shiny looking Mohs scale 3 - 4 (Not scratch with fingernail(2), but scratch with wire nail (4)) Potassium Feldspar (K-feldspar), These films might provide some New Year's inspiration, in case 2022 is looking too bleak. These days I’m perfectly content to take inspiration from wherever it comes. It’s probably an exaggeration to suggest that the human race has reached ..., Galena has since collaborated with a great number of Bulgarian artists including Niki Nankov, Malina, Preslava and Andrea and is currently one of the most popular singers in the country.. From 2021 to 2022, Galena was a coach on The Voice of Bulgaria.In her first series as a coach, Petya Paneva, a member of her team, won the competition on 12 December 2021., Where: 14946 S. Bell Road, Homer Glen, Illinois (about 31 miles from Chicago) Dates: Sunflower field will open August, 2023. Hours: Monday-Friday 9-6, Saturday 9-5, Sunday 9-3 (field closes a half hour before closing times). Hours are subject to change. Cost: The fee for visitors is $7 each which includes 1 sunflower., hematite, also spelled haematite, heavy and relatively hard oxide mineral, ferric oxide (Fe 2 O 3 ), that constitutes the most important iron ore because of its high iron content (70 percent) and its abundance. Its name is derived from the Greek word for "blood," in allusion to its red colour. Many of the various forms of hematite have ..., My 1st. set was on the lines of the WW 2 Fox Hole radio-it used a Gillete shaving blade after rusting half of it—the next one used a Galena rock which when powdered was used as eyelash makeup by the local YLs ! Both these sets were the true cats whisker kind, to locate stations., Check out our galena stone selection for the very best in unique or custom, handmade pieces from our metaphysical crystals shops., Galena, or lead sulfide, the world’s major source of lead ore, occurs worldwide; and, it is mined in many countries, including the United States, Australia and China. Lead is one of the earliest metals exploited by man because of its low me..., Table Rock Lake Home For Sale $339,900 Oh my goodness, shut the front door!! No, not really open all Real Estate Ad:4309143. Buy. ... 30 Waters Edge Drive, Galena, MO 65656. 2 br, 2.0 ba, 1968 1185 sf Stone County Ad #: 4309143 Lake Home For Sale Oh my goodness, shut the front door!! ..., Rocks and Minerals Found in Alaska. Due to Alaska’s immense size and diverse geology, there is almost no limit to the varieties of rocks and minerals you can find here. In addition to typical common rock types like granite, schist, and sandstone, there are countless mineral species within Alaska’s borders., Browse 59 galena mineral photos and images available, or start a new search to explore more photos and images. Browse Getty Images' premium collection of high-quality, authentic Galena Mineral stock photos, royalty-free images, and pictures. Galena Mineral stock photos are available in a variety of sizes and formats to fit your needs. , This Rocks & Geodes item is sold by Minterest. Ships from Bulgaria. Listed on Oct 20, 2023. ... We have the best specimens like Galena (Spinel Law Twins, Twinned Galena, Cubic Galena, Skeletal Galena), Sphalerite (GEM Sphalerite var Cleiophane, Black Sphalerite), Pyrite (Fool's Gold, Iron Pyrite, Iron Sulfide), Quartz (Milky Quartz, Clear ..., Mar 5, 2013 - Explore vvv one's board "Apatite", followed by 177 people on Pinterest. See more ideas about apatite, gems and minerals, gemstones., Department of Economic & Tourism Development Fax: 410-778-7482 Email: [email protected] Jamie Williams, CEcD, Director Phone: 410-810-2168 Email: [email protected] Katie Wright, Economic Development Manager, Welcome the season of Autumn with themed crafts and a warm drink in the cozy Rock Hall branch. Space is limited, please register. More information. Good morning HomePorts! ... Galena: Millington: Rock Hall . Government Center. 400 High St. Chestertown, MD 21620 410-778-4600, As you might have inferred, geodes in Iowa are best found in the area around the town of Keokuk. This region is host to an insane amount of geodes and it’s a bucket list spot for many rockhounds. 8. Galena. Galena mineral specimen. Galena is a fascinating ore and a primary source of lead for much of the world., galena, chalcopyrite, cinnabar: PbS, CuFeS 2, HgS: Ores of lead, copper, mercury: Sulphates: gypsum, epsom salts: CaSo 4 ·2H 2 O, MgSO 4 ·7H 2 O: ... respectively. Some carbonate rocks, such as calcite and dolomite, are formed via evaporation and precipitation. However, most carbonate-rich rocks, such as limestone, are created by the ..., Chalcopyrite. Chalcopyrite is a mineral and ore of copper. Its chemical composition is CuFeS2, meaning it contains copper (Cu), iron (Fe), and sulfur (S). Chalcopyrite is one of the most important copper ores and is widely distributed in various geological environments. It is often found in association with other sulfide minerals., Galena: Galena is a common lead sulfide mineral that can sometimes be associated with gold deposits. It can occur in the same rock formations as gold and may be present in ores that contain both lead and gold. ... Rocks and minerals. 2nd ed. London: DK Publishing. Handbookofmineralogy.org. (2019). Handbook of Mineralogy. [online] Available at ..., Sphalerite occurs in roughly the same areas as galena in Illinois, so the areas to look at are much the same. Galena, in particular, seems to have a lot of sphalerite mixed in with the lead ore, but the best collectible samples seem to come from the Southeast in Harris County. 7. Quartz. Quartz is an iconic crystal., Galena: Ore of Lead. Hematite: Ore of Iron. Graphite: Dry Lubricant. Sphalerite: Ore of Zinc. Gypsum: Dry Wall. Calcite: Marble, cement. Study with Quizlet and memorize flashcards containing terms like List the five characteristics an Earth material must have in order to be considered a mineral., Use the geologic definition of a mineral to ..., Multi colored rounded river rocks for landscaping Lava rock prices. Lava rock costs $80 to $240 per ton or $50 to $180 per cubic yard, depending on the location and color.Lava rock prices are $20 to $50 per 10- to 50-lb. bag. Lava rock is known as "scoria" and comes in red, black, and grey colors. Lava rock prices per ton and per yard - chart, Galena (also Galena City) is an unincorporated community in Lawrence County, South Dakota, United States. It is often considered to be a ghost town, even though a few families still live in the area. It is not tracked by the U.S. Census Bureau. Naming., Various sedimentary, igneous, and metamorphic rocks are found in Missouri. The most popular is the mozarkite rock, which is a form of chert and is a beautiful sedimentary rock. Other popular rocks that you can find include various geodes, agate, flint, obsidian, chert, or staurolite, among others., Galena is also found near Pleasanton, Linn County, and has been reported from Chautauqua, Douglas, Elk, and Sumner counties and in rock fragments brought to the surface during drilling for oil in many other counties. Galena from Tri-State District of Southeastern Kansas. Sphalerite (hardness 3 1/2-4) , A mineral's hardness is a measure of its relative resistance to scratching, measured by scratching the mineral against another substance of known hardness on the Mohs Hardness Scale. This graphic outlines the index minerals and some common objects that are used to determine a mineral's hardness. This method is especially useful for identifying ..., This article will dive deeper into the many great rockhounding sites across the state (along with maps), but I’d like to highlight a few standouts here. The top 10 rockhounding sites for rocks and minerals in Kansas: Smoky Hill River – Moss Agate, Chalk. Topeka – Lake Superior Agates. Geary County – Agatized wood. , The MEC Mineral Baby details the estimated amount of minerals, metals and fuels that an American born this year will use in their lifetime. In 2023, this amount is 3.07 million pounds. This is calculated with statistics from the National Mining Association and the U.S. Geological Survey (USGS), in combination with life expectancy data from the ..., Mar 5, 2013 - Explore vvv one's board "Apatite", followed by 177 people on Pinterest. See more ideas about apatite, gems and minerals, gemstones., 11/01/2016. PUB0658. Galena is metallic lead gray with a bright metallic luster when freshly broken, and dark gray to black when weathered. It is brittle and very heavy (about 7.6 times as heavy as water). Galena most commonly forms cubic crystals, and breaks with perfect cubic cleavage. 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