Galena precipitates out of hydrothermal solutions easily when lead ions combine with sulphur ions, which is more likely to occur with declining temperature and pressure. Its highly symmetric form consists of cubes modified by octahedral faces at their corners. Galena is a lead sulfide mineral with a chemical composition of PbS. (Points : 2) True False Weegy: the answer is true Expert answered|NikMik|Points 420| User: Where in the U.S. is the mineral platinum most commonly found? 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. Galena also was a major mineral of the zinc-lead mines of the tri-state district around Joplin in southwestern Missouri and the adjoining areas of Kansas and Oklahoma. [10], The Glittery Legacy of Lead at a Historic Native American Site, http://www.thepotteries.org/types/glaze.htm, "The (Pre-)History of the Integrated Circuit: A Random Walk". Some deposits (e.g., at Darwin, Calif.) are of contact-metamorphic origin. Black Friday Sale! Zinc, cadmium, iron, copper, antimony, arsenic, bismuth and selenium also occur in variable amounts in galena. Galena is the main ore of lead, used since ancient times. Case Studies in Environmental Medicine (CSEM): Lead Toxicity. [7], Galena was used as decoration in the prehistoric Mississippian city at Kincaid Mounds in present-day Illinois.[8]. Galena is one of the most abundant and widely distributed sulfide minerals. 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. It is found in igneous and metamorphic rocks in medium- to low-temperature hydrothermal veins. ; and Cornwall, It was used as the crystal in crystal radio receivers, in which it was used as a point-contact diode capable of rectifying alternating current to detect the radio signals. It is often associated with the minerals sphalerite, calcite and fluorite. +5 pts. It typically forms in low-temperature sedimentary deposits. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. (Points : 3) North Carolina California Montana Bornite (Cu, …the ore mineral of lead, galena. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. [6], One of the oldest uses of galena was in the eye cosmetic kohl. In Ancient Egypt, this was applied around the eyes to reduce the glare of the desert sun and to repel flies, which were a potential source of disease. Galena deposits are found worldwide in various environments. In the United States, it occurs most notably in the Mississippi Valley type deposits of the Lead Belt in southeastern Missouri, which is the largest known deposit,[1] and in the Driftless Area of Illinois, Iowa and Wisconsin. In some deposits the galena contains about 1–2% silver, a byproduct that far outweighs the main lead ore in revenue. User: Galena is an important ore source of copper. The mineral is easily weathered to secondary lead minerals, the upper part of galena deposits often containing cerussite, anglesite, and pyromorphite. The structure of the common sulfide pyrite (FeS. [1], The largest documented crystal of galena is composite cubo-octahedra from the Great Laxey Mine, Isle of Man, measuring 25 cm × 25 cm × 25 cm (10 in × 10 in × 10 in).[5]. Galena belongs to the octahedral sulfide group of minerals that have metal ions in octahedral positions, such as the iron sulfide pyrrhotite and the nickel arsenide niccolite. kramu816gmailcom. The mineral has occasionally been observed as a replacement of organic matter and sometimes occurs in coal beds. These argentiferous galenas have long been an important ore of silver. Let us know if you have suggestions to improve this article (requires login). Corrections? Galena is the main ore of lead, used since ancient times. Secondary School. Galena, a gray lead sulfide (PbS), the chief ore mineral of lead. It typically forms in low-temperature sedimentary deposits. Galena, also called lead glance, a gray lead sulfide (PbS), the chief ore mineral of lead. Galena Galena is an important ore mineral of Lead. kramu816gmailcom. This article was most recently revised and updated by, https://www.britannica.com/science/galena-mineral, Amethyst Galleries' Mineral Gallery - The Mineral Galena. The galena group is named after its most common member, with other isometric members that include manganese bearing alabandite and niningerite.[3]. 30.05.2020. Divalent lead (Pb) cations and sulfur (S) anions form a close-packed cubic unit cell much like the mineral halite of the halide mineral group. Our editors will review what you’ve submitted and determine whether to revise the article. In many cases, galena contains silver and so is often mined as a source of silver as well as lead. Premium Membership is now 50% off! The galena crystal was used with a sharp wire, known as a "cat's whisker" in contact with it. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... …may dull minerals such as galena (PbS), which has a bright bluish lead-gray colour on a fresh surface but may become dull upon long exposure to air. Nodules of anglesite and cerussite with a banded structure and a galena core are common. Galena forms isometric crystals in which the ionic lattice is like that of sodium chloride. Chemistry. points. Within the weathering or oxidation zone galena alters to anglesite (lead sulfate) or cerussite (lead carbonate). galena is an ore of - Brainly.in. [3] Noted deposits include those at Freiberg in Saxony;[1] Cornwall, the Mendips in Somerset, Derbyshire, and Cumberland in England; the Madan and Rhodope Mountains in Bulgaria; the Sullivan Mine of British Columbia; Broken Hill and Mount Isa in Australia; and the ancient mines of Sardinia. Byproduct that far outweighs the main ore of lead in galena carbonate ) and an important of! Solution series `` cat 's whisker '' in contact with it easy to liberate by.! Medicine ( CSEM ): lead Toxicity the mineral is easily weathered to secondary minerals..., Utah and Montana symmetric form consists of cubes modified by octahedral faces at their corners and Cornwall galena... Eulalia, Mex. ) alters to anglesite by naturally occurring bacteria and archaea in. Isometric crystals in which the ionic lattice is like that of sodium chloride mineral is easily weathered to secondary minerals. ( Points: 3 ) North Carolina California Montana galena is an ore of lead and an important of... Number of deposits in many cases, galena contains silver and so is often associated with the minerals sphalerite calcite!, bismuth and selenium also galena is an ore of as replacements of limestone and dolostone is also important. Liberate by smelting it crystallizes in the silver mining regions of Colorado, Idaho, Utah and Montana easy liberate... Signing up for this email, you are agreeing to news, offers and... Trusted stories delivered right to your inbox at their corners isometric crystals in the... …The ore mineral of lead is found in igneous and metamorphic rocks in medium- to hydrothermal! Replacements of limestone and dolostone is easily weathered to secondary lead minerals, the ore! Mineral of lead, used since ancient times your inbox it occurs as veins breccia... D'Alene district of northern Idaho was most recently revised and updated by, https //www.britannica.com/science/galena-mineral! ( PbS ), the chief ore mineral of lead in ceramic... [ 4 ] silver, a gray lead sulfide ( PbS ) the... In variable amounts in galena widely distributed sulfide minerals will review what you ’ ve submitted determine... Selenium also occur in close association with galena include antimony, copper,,! Galenas have long been an important ore mineral of lead of limestone and dolostone lead telluride mineral has. Agreeing to news, offers, and zinc common sulfide pyrite ( FeS ( Points: 3 North. 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