General Information:
Chemical Formula:
Fe+++(8-2x)[(As(1-x),S(x))O4]6·5(H2O)
Environment:
Occurs in voids in massive scorodite.
IMA Status:
Approved IMA
Locality:
Found on waste dumps of the former gold and arsenic mines in the Gold Hill district, western Tooele County, Utah, USA.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[???] Good
Color:
brown orange or yellow orange.
Density:
4.238
Diaphaniety:
Transparent
Habits:
Encrustations - Forms crust-like aggregates on matrix., Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Powdery - Forms a loose, poorly-coherent pulverulent mass.
Hardness:
3 - Calcite
Luster:
Greasy (Oily)
Streak:
orange
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