Sainfeldite

sainfeldite

picropharmacolite

ferrarisite

rauenthalite

Images

Formula: Ca5(AsO4)2(AsO3OH)2.4H2O
Hydrated acid arsenate, hureaulite group
Specific gravity: 3.04
Hardness: 4
Streak: White
Colour: Colourless to light pink
Common impurities: Co
Environments

Hydrothermal environments

Localities

At the type locality, the Gabe Gottes mine, Sankt Jakob vein, Neuenberg, Ste Marie-aux-Mines, Colmar-Ribeauvillé, Haut-Rhin, Grand Est, France, sainfeldite is a post-mine low-temperature reaction product of carbonate gangue with solutions derived from arsenic. Associated minerals include picropharmacolite, pharmacolite, ferrarisite, rauenthalite, fluckite, phaunouxite, calcite and löllingite (HOM).

At Bou Azzer, Morocco, sainfeldite is associated with irhtemite (HOM).

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