File:Brucite (Premier Chemicals Mine, Paradise Range, Nevada, USA) 5.jpg
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| Description |
English: Brucite from the Mesozoic of Nevada, USA. (collected in 1970; ~8.8 centimeters across at its widest)
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5800 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. The hydroxide minerals all contain one or more hydroxide anions (OH-). Brucite is a magnesium hydroxide mineral - Mg(OH)2. It usually forms by alteration of ultramafic rocks and is often associated with serpentinite and talcose rocks. Brucite forms platy hexagonal crystals with a hardness of 2.5 to 3 on the Mohs Scale. It superficially resembles talc somewhat, but is harder. Brucite has one perfect cleavage, and breaks into thin sheets like mica. Seen here is a magnesium ore sample - this is rock-forming brucite from a mine in west-central Nevada. At the site, magnesite and brucite are mined for their magnesium content. The deposits are hosted by the Triassic-aged Luning Formation. Published research has concluded that the brucite formed by contact metamorphic replacement (metasomatism). During the Jurassic or Cretaceous, a granodiorite intrusion was emplaced in the area and converted magnesite (MgCO3, magnesium carbonate) to brucite (Mg(OH)2, magnesium hydroxide). Stratigraphy of host rocks: upper member, Luning Formation, Upper Triassic Locality: Premier Chemicals Mine (also known as: Gabbs Magnesite-Brucite Mine / Basic Refractories Mine / Sierra Magnesite Mine), Gabbs Mining District, western flanks of the Paradise Range, Nye County, west-central Nevada, USA (vicinity of 38° 51' 53 North latitude, 117° 53' 34 West longitude) Photo gallery of brucite: www.mindat.org/gallery.php?min=820 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52548061728/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/52548061728. It was reviewed on 7 December 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 16:34, 7 December 2022 | | 2,987 × 2,434 (4.08 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52548061728/ with UploadWizard |
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