Kraisslite

arsenate

willemite

Formula: Zn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2 [(Si,As5+)O4]10
Compound arsenate
Specific gravity: 3.876
Hardness: 3 to 4
Streak: Golden brown
Colour: Deep copper brown
Environments:

Metamorphic environments
Hydrothermal environments

Kraisslite occurs as a secondary mineral in micaceous veinlets and fracture fillings in the zincite zone of a metamorphosed zinc deposit, (Dana, Webmin) associated with zincite, willemite, sussexite, sphalerite, rhodochrosite, pyrochroite, franklinite, baryte and austinite (Mindat, AM63.938).

Common impurities: Al,H2O

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