galena is an ore of

It crystallizes in the cubic crystal system often showing octahedral forms. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. kramu816gmailcom. Galena Galena is an important ore mineral of Lead. [7], Galena was used as decoration in the prehistoric Mississippian city at Kincaid Mounds in present-day Illinois.[8]. Because of its somewhat low melting point, it was easy to liberate by smelting. 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. [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]. +5 pts. ; and Cornwall, Eng. Galena is one of the most abundant and widely distributed sulfide minerals. [citation needed]. Galena is the main ore of lead, used since ancient times. It typically forms in low-temperature sedimentary deposits. 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. In some deposits the galena contains about 1–2% silver, a byproduct that far outweighs the main lead ore in revenue. 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. Of the latter, the Coeur d'Alene district of northern Idaho was most prominent. Other commercially important minerals that frequently occur in close association with galena include antimony, copper, and zinc. Chemistry. [9], Galena is a semiconductor with a small band gap of about 0.4 eV, which found use in early wireless communication systems. The structure of the common sulfide pyrite (FeS. 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. 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. Updates? Case Studies in Environmental Medicine (CSEM): Lead Toxicity. The mineral is easily weathered to secondary lead minerals, the upper part of galena deposits often containing cerussite, anglesite, and pyromorphite. It mainly forms by the hydrothermal process of ore formation. Selenium substitutes for sulfur in the structure constituting a solid solution series. kramu816gmailcom. It is often associated with the minerals sphalerite, calcite and fluorite. Secondary School. points. Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Zinc, cadmium, iron, copper, antimony, arsenic, bismuth and selenium also occur in variable amounts in galena. [6], One of the oldest uses of galena was in the eye cosmetic kohl. 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. In these deposits significant amounts of silver occur as included silver sulfide mineral phases or as limited silver in solid solution within the galena structure. Galena forms isometric crystals in which the ionic lattice is like that of sodium chloride. Large deposits also occur as replacements of limestone or dolomite (e.g., at Santa Eulalia, Mex.). [10], The Glittery Legacy of Lead at a Historic Native American Site,, "The (Pre-)History of the Integrated Circuit: A Random Walk". It is the world's primary ore of lead and is mined from a large number of deposits in many countries. [1] Galena is also an important ore mineral in the silver mining regions of Colorado, Idaho, Utah and Montana. Galena is the main ore of lead, used since ancient times., Articles with dead external links from December 2019, Articles with permanently dead external links, Short description is different from Wikidata, Articles with unsourced statements from April 2014, Creative Commons Attribution-ShareAlike License, Cubes and octahedra, blocky, tabular and sometimes skeletal crystals, This page was last edited on 25 November 2020, at 12:13. This article was most recently revised and updated by,, Amethyst Galleries' Mineral Gallery - The Mineral Galena. It is the most important ore of lead and an important source of silver.[4]. Because of its somewhat low melting point, it was easy to liberate by smelting. Galena deposits are found worldwide in various environments. Some deposits (e.g., at Darwin, Calif.) are of contact-metamorphic origin. Galena is the primary ore of lead, and is often mined for its silver content, such as at the Galena Mine in northern Idaho. Our editors will review what you’ve submitted and determine whether to revise the article. galena is an ore of - [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. (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? Nodules of anglesite and cerussite with a banded structure and a galena core are common. Its highly symmetric form consists of cubes modified by octahedral faces at their corners. Bornite (Cu, …the ore mineral of lead, galena. Galena is a lead sulfide mineral with a chemical composition of PbS. The lead telluride mineral altaite has the same crystal structure as galena. It typically forms in low-temperature sedimentary deposits. Galena is found in cavities and brecciated (fractured) zones in limestone and chert, as in the extensive Mississippi River valley deposits, where 90 percent of the U.S. production of lead is mined. Galena exposed to acid mine drainage can be oxidized to anglesite by naturally occurring bacteria and archaea, in a process similar to bioleaching. Black Friday Sale! In many cases, galena contains silver and so is often mined as a source of silver as well as lead. (Points : 3) North Carolina California Montana Omissions? Galena, a gray lead sulfide (PbS), the chief ore mineral of lead. Premium Membership is now 50% off! The galena group is named after its most common member, with other isometric members that include manganese bearing alabandite and niningerite.[3]. Galena, also called lead glance, a gray lead sulfide (PbS), the chief ore mineral of lead. check. These argentiferous galenas have long been an important ore of silver. Let us know if you have suggestions to improve this article (requires login). The galena crystal was used with a sharp wire, known as a "cat's whisker" in contact with it. In sedimentary rocks it occurs as veins, breccia cements, isolated grains, and as replacements of limestone and dolostone.

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