Sainfeldite

sainfeldite

picropharmacolite

ferrarisite

rauenthalite

Images

Formula: Ca₅(AsO₄)₂(AsO₃OH)₂.4H₂O
Hydrated acid arsenate, hureaulite group
Crystal System: Monoclinic
Specific gravity: 3.04 measured, 2.99 calculated
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).
Sainfeldite from the Sankt Jakob vein - Image

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

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