![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Otwayite.jpg/640px-Otwayite.jpg&w=640&q=50)
Otwayite
From Wikipedia, the free encyclopedia
Otwayite, Ni2CO3(OH)2, is a hydrated nickel carbonate mineral. Otwayite is green, with a hardness of 4, a specific gravity of 3.4, and crystallises in the orthorhombic system.
Quick Facts General, Category ...
Otwayite | |
---|---|
![]() Otwayite from the type locality in Otway Nickel deposit | |
General | |
Category | Carbonate mineral |
Formula (repeating unit) | Ni2CO3(OH)2 |
IMA symbol | Otw[1] |
Strunz classification | 5.DA.15 |
Crystal system | Orthorhombic Unknown space group |
Unit cell | a = 10.18, b = 27.4, c = 3.22 [Å]; Z = 8 |
Identification | |
Color | Bright green |
Crystal habit | Sprays of Fibrous bundles oriented perpendicular to veinlet walls; spherules and claylike coatings |
Mohs scale hardness | 4 |
Luster | Silky to waxy |
Diaphaneity | Opaque to translucent |
Specific gravity | 3.41 |
Optical properties | Biaxial |
Refractive index | nα = 1.650 nγ = 1.720 |
Birefringence | δ = 0.070 |
Pleochroism | Weak |
Dispersion | Very strong |
References | [2][3] |
Close