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Formula: Ca5(AsO3OH)2(AsO4)2.9H2O
Hydrated hydrogen arsenate,
paramorph of ferrarisite
Crystal System: Monoclinic
Specific gravity: 2.68 to 2.76 measured, 2.74 calculated
Hardness: 1½
Streak: White
Colour: Colourless
Luminescence: Not fluorescent under UV
Environments
Guérinite occurs as acicular, bladed or tabular crystals; it is a recent weathering product in oxidising
arsenic-rich mineral deposits. Associated minerals include
realgar, erythrite,
quartz and calcite, and it may be
intergrown with jeankempite
(Mindat, HOM).
Localities
At the type locality, the Daniel Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany,
guérinite is a post-mine product
(Mindat).
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