Brassite
| Brassite | |
|---|---|
 Brassite (white) accompanied by rösslerite | |
| General | |
| Category | Arsenate mineral |
| Formula (repeating unit) | Mg(AsO3OH)·4(H2O) |
| IMA symbol | Bsi[1] |
| Strunz classification | 8.CE.15 |
| Dana classification | 39.01.07.01 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pbca |
| Unit cell | a = 7.472 Å, b = 10.891 Å, c = 16.585 Å; Z = 8 |
| Identification | |
| Color | White |
| Crystal habit | Cryptocrystalline crusts |
| Cleavage | {001} Perfect |
| Fracture | Irregular/uneven, splintery |
| Tenacity | Brittle |
| Luster | Silky, dull, earthy |
| Streak | White |
| Diaphaneity | Translucent |
| Specific gravity | 2.28 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.531 nβ = 1.546 nγ = 1.562 |
| Birefringence | 0.031 |
| Pleochroism | Non-pleochroic |
| 2V angle | 80° |
| Dispersion | r < v moderate |
| Solubility | +++ HCl, + H2O |
| References | [2][3][4][5] |
Brassite is a rare arsenate mineral with the chemical formula Mg(AsO3OH)·4(H2O). It was named brassite, in 1973, to honor French chemist Réjane Brasse, who first synthesized the compound. The type locality for brassite is Jáchymov of the Czech Republic.[3]
It occurs as an alteration of magnesium carbonate minerals by arsenic bearing solutions. It occurs associated with pharmacolite, picropharmacolite, weilite, haidingerite, rauenthalite, native arsenic, realgar and dolomite.[4]
Localities
[edit]Czech Republic:
- Jáchymov, Ore Mountains, Karlovy Vary Region, 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
[edit]- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Webmineral.com - Brassite
- ^ a b Mindat.org - Brassite
- ^ a b "Handbook of Mineralogy - Brassite" (PDF). Archived from the original (PDF) on 2016-03-03. Retrieved 2013-01-25.
- ^ Mineralatlas.com - Brassite
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