General Information:
Chemical Formula:
([ ],Ni)9(AsO4)2(AsO6) (?)
Composition:
(Molecular Weight = 976.97 gm)
Nickel 54.07 % Ni
Arsenic 23.01 % As
Oxygen 22.93 % O
Empirical Formula:
Ni9As3O14
Environment:
Found in the walls of furnaces used to roast ore.
IMA Status:
Approved IMA 1965
Locality:
TL: South Terres mine, St Austell, Cornwall, England.
Name Origin:
Named from the Greek for 'copper rust', in allusion to its appearance.
Physical Properties:
Color:
deep blue green or green.
Density:
5.85 - 5.95, Average = 5.9
Diaphaniety:
Opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Euhedral Crystals - Occurs as well-formed crystals showing good external form., Encrustations - Forms crust-like aggregates on matrix.
Hardness:
4 - Fluorite
Streak:
greenish white
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