User:Chris857/Pyrochroite
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Pyrochroite is a mineral with formula Mn(OH)2.
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| Pyrochroite | |
|---|---|
 Black pyrochroite crystals with tan pyroaurite in a calcite matrix | |
| General | |
| Category | Minerals |
| Formula | Mn(OH)2 |
| Strunz classification | 4.FE.05 |
| Dana classification | 6.2.1.3 |
| Crystal system | Trigonal |
| Space group | Hexagonal Scalenohedral H-M symbol: 3m (3 2/m) |
| Unit cell | a = 3.31Å, c = 4.74Å, Z = 1[1] |
| Identification | |
| Cleavage | Perfect on {0001} |
| Tenacity | Elastic |
| Mohs scale hardness | 2.5 to 3 |
| Luster | Pearly on cleavages[1] Adamantine [2] |
| Streak | White[2] |
| Diaphaneity | Translucent, opaque |
| Density | 3.23 to 3.27 g/cm3 |
| Optical properties | Uniaxial (-) |
| Refractive index | nω = 1.680 to 1.681 nε = 1.720 to 1.723 |
| Birefringence | δ = 0.040 |
| Pleochroism | Visible |
| Ultraviolet fluorescence | Non-fluorescent[2] |
| References | [3] |
Description
Pyrochroite has been found in association with alabandite, barite, calcite, dolomite, galaxite, hausmannite, lead, manganosite, rhodochrosite, and tephroite.[1]
History
Distribution
Pyrochroite has been found in Canada, China, Ghana, Japan, Namibia, Romania, Russia, South Africa, Sweden, Switzerland, the UK, the US, and along the Mid-Atlantic Ridge.[3]
