Sainfeldite

sainfeldite

picropharmacolite

ferrarisite

rauenthalite

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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).

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

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