Otwayite

Otwayite, Ni2CO3(OH)2, is a hydrated nickel carbonate mineral first described from the Otway Nickel Deposit, Nullagine, Pilbara Craton, Western Australia.Otwayite is green, with a hardness of 4, a specific gravity of 3.4, and crystallises in the orthorhombic system.
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General Information:
 Chemical Formula:
Ni2(CO3)(OH)2·(H2O)
 Composition:
(Molecular Weight = 229.42 gm)
Nickel 51.16 % Ni
Hydrogen 1.76 % H 
Carbon 5.24 % C 
Oxygen 41.84 % O 
 Empirical Formula:
Ni2(CO3)(OH)2·(H2O)
 Environment:
Late-stage fracture filling.
 IMA Status:
Approved IMA 1977
 Locality:
Nullagine region of WA, Australia.
 Name Origin:
Named after Charles Albert Otway (1922-), minera and prospector of Cosnells, WA, Australia.
Physical Properties:
 Color:
green or bright green.
 Density:
3.41
 Habits:
Fibrous - Crystals made up of fibers., Aggregates - Made of numerous individual crystals or clusters.,
 Hardness:
4 - Fluorite
 Luster:
Silky
 Streak:
light green
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