Brucite (Premier Chemicals Mine, Paradise Range, Nevada, USA) 4 : 無料・フリー素材/写真
Brucite (Premier Chemicals Mine, Paradise Range, Nevada, USA) 4 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Brucite from the Mesozoic of Nevada, USA. (collected in 1970; ~7.6 centimeters across along the base)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 TriassicLocality: 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 |
| 撮影日 | 2022-09-26 13:35:09 |
| 撮影者 | James St. John |
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