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Formula: Ca(AsO3OH)
Arsenate
Crystal System: Triclinic
Specific gravity: 3.48 measured, 3.45 calculated
Streak: White
Colour: White
Luminescence: Not fluorescent under UV
Environments
Weilite is a rare secondary mineral in the oxidised zone of
arsenic-bearing hydrothermal mineral deposits. Associated minerals include
pharmacolite, haidingerite and
picropharmacolite
(HOM).
Localities
There are three co-type Localities:
Gabe Gottes Mine, Sankt Jakob vein, Neuenberg, Sainte-Marie-aux-Mines, Colmar-Ribeauvillé, Haut-Rhin, Grand Est, France
Wittichen, Schenkenzell, Rottweil, Freiburg Region, Baden-Württemberg, Germany
Schneeberg, Erzgebirgskreis, Saxony, Germany
Weilite occurs as a secondary mineral in the oxidised zone of
arsenic-rich veins; it is often an alteration product of
pharmacolite and haidingerite. The
implied dehydration takes place in 3 months at 120oC, but does not proceed in the same time at ordinary temperatures,
even in the presence of P2O5 or H2SO4.
Weilite occurs as powdery incrustacions or pseudomorphs after
pharmacolite or haidingerite
(AM 49.2.816).
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