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Mineralpedia Details for Kaatialaite

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Kaatialaite

Kaatialaite

Named after the type locality in the Kaatiala pegmatite in Finland. Kaatialaite is a rare mineral that occurs in granite pegmatites and in oxidized silver-arsenic veins in gabbro. Additional localities include in Germany, the Czech Republic, and the United States. Associated minerals include arsenolite, lollingite, calcite, and gypsum. The water content of the mineral is variable depending on relative humidity. It will also become cloudy upon exposure to light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/kaatialaite.pdf

Formula
Fe3+(H2AsO4)3ยท3H2
Crystal System
Monoclinic 
Crystal Habit
Acicular, Lath 
Color
greenish blue, gray, yellow, white 
Streak
white 
Class
Monoclinic 
Hardness
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Kaatialaite from Svornost mine, Jáchymov, Erzgebirge, Bohemia, Czech Republic

Kaatialaite
            from Svornost mine, Jáchymov, Erzgebirge, Bohemia, Czech Republic

White spherulitic crystals to less than <0.75mm with good coverage across face associated with fine, clear blades to less tan 0.5mm of Claudetite and native Arsenic.

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