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Coyoteite
Coyoteite is a hydrated sodium iron sulfide mineral. The mineral was named coyoteite after Coyote Peak near Orick, California where it was discovered (along with another rare mineral, orickite).〔
This mineral is unstable under normal atmospheric conditions, making it rare at the surface. The mineral was first described in a petrographic study of a sample of a mafic diatreme at Coyote Peak. The largest piece of coyoteite found on that specimen has the dimensions of 0.2 × 0.4 mm.〔
==Chemical composition and properties==
The chemical formula of the mineral is NaFe3S5·2H2O.〔 It was obtained by the analysis of five grains using the 10-kV EMX-SM electron microprobe.〔 The total concentration of detected elements was less than 100% (90.7 weight percent). Qualitative analyses and TAP crystal were used to find the missing 9.31%. The results confirmed the missing elements to be hydrogen and oxygen, which are undetectable by the electron microprobe.〔 It was unclear however whether the hydrogen and oxygen are in the form of water or a hydroxide.〔
The mineral is insoluble in cold acids, such as HCl, but dissolves upon heating.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Coyoteite」の詳細全文を読む
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