Magnesite (Windous Magnesite Deposit, Tertiary; Westvaco Chlorine Products mine, southwest of Ely, Nevada, USA) 5 : 無料・フリー素材/写真
Magnesite (Windous Magnesite Deposit, Tertiary; Westvaco Chlorine Products mine, southwest of Ely, Nevada, USA) 5 / 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 | Magnesite rock from the Tertiary of Nevada, USA.Magnesite is a magnesium carbonate mineral (MgCO3). It is the end member of a chemical continuum with dolomite (CaMg(CO3)2) and calcite (CaCO3). It often forms coarsely-crystalline masses or chalky / earthy masses. It has a nonmetallic luster and can be any color, but is often whitish. It has a white streak, a hardness of about 3.5 to 4.5, and rhombohedral cleavage. Magnesite is usually the result of metamorphic chemical alteration of Mg-bearing rocks such as peridotites and serpentinites by the action of carbonic acid-rich fluids.Seen here is earthy magnesite from an inactive magnesite mine in eastern Nevada's Currant Creek District. Published studies indicate that magnesite in the area formed by hydrothermal alteration / replacement of volcanic tuff beds in the Tertiary-aged Currant Tuff.Locality: Westvaco Chlorine Products mine (inactive), southeast of Windous Butte, northeastern Currant Creek Magnesite District, southwest of the town of Ely, eastern Nevada, USA (apparently in the vicinity of 38° 55' 41.85" North latitude, 115° 09' 43.08" West longitude)--------------Some info. from:Faust & Callaghan (1948) - Mineralogy and petrology of the Currant Creek magnesite deposits and associated rocks of Nevada. Bulletin of the Geological Society of America 59: 11-74.--------------Photo gallery of magnesite:www.mindat.org/gallery.php?min=2482 |
| 撮影日 | 2022-10-07 12:56:57 |
| 撮影者 | James St. John |
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