Brassite
| Brassite | |
|---|---|
| General | |
| Category | Mineral |
| Formula (repeating unit) | Mg(AsO3OH)•4(H2O) |
| Strunz classification | 08.CE.15 |
| Dana classification | 39.01.07.01 |
| Crystal system | Orthorhombic |
| Identification | |
| Color | White |
| Cleavage | {001} Perfect |
| Fracture | Irregular/Uneven, Splintery |
| Tenacity | Brittle |
| Streak | White |
| Diaphaneity | Translucent |
| Density | 2.28 |
| Optical properties | Biaxial (+) |
| Birefringence | 0.031 |
| Pleochroism | Non-pleochroic |
| 2V angle | 80◦ |
| Dispersion | r < v moderate |
| Solubility | +++ HCl, + H2O |
| References | [1][2][3][4] |
Brassite is a mineral with the chemical formula Mg(AsO3OH)•4(H2O). It was named brassite, in 1973, to honor French chemist R`ejane Brasse, who first synthesized the compound. The type locality for brassite is Jáchymov of the Czech Republic.[2]
Localities
Czech Republic:
- Jáchymov (St Joachimsthal), Jáchymov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia, Czech Republic
France:
- Salsigne mine, Salsigne, Mas-Cabardès, Carcassonne, Aude, Languedoc-Roussillon, France
- Villanière (slag locality), Salsigne, Mas-Cabardès, Carcassonne, Aude, Languedoc-Roussillon, France
Germany:
- Wilhelm Mine (Wechselschacht), Bauhaus, Richelsdorf District, Hesse, Germany
- Ore dumps, Richelsdorf Smelter, Süss, Richelsdorf District, Hesse, Germany
References
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