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Brassite

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Category  Arsenate mineral
Strunz classification  8.CE.15
Crystal system  Orthorhombic
Formula (repeating unit)  Mg(AsO3OH)·4(H2O)
Dana classification  39.01.07.01
Crystal class  Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)

Brassite is a rare arsenate 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.

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.

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

    Brassite Wikipedia


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