Coyoteite
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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).[2]
Quick Facts General, Category ...
Coyoteite | |
---|---|
General | |
Category | Sulfide mineral |
Formula (repeating unit) | (NaFe3S5·2H2O) |
IMA symbol | Coy[1] |
Strunz classification | 2.FD.25 |
Dana classification | 02.14.06.01 |
Crystal system | Triclinic Unknown space group |
Identification | |
Color | black |
Crystal habit | Irregular grains - occurs as splotchy, anhedral crystals forming inclusions in other minerals |
Cleavage | {111} Perfect |
Mohs scale hardness | 1-1.5 |
Luster | Metallic |
Streak | black |
Diaphaneity | Opaque |
Specific gravity | 2.5 - 2.62 measured; 2.879 calculated |
Pleochroism | Faint, from gray to pink |
Other characteristics | Moderately magnetic |
References | [2][3][4][5] |
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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.[2]