Hydrated normal arsenate, wicksite group
Specific gravity: 3.8
Colour: Dark red-brown
Grischunite is a rare arsenate found only at its type locality to date
At the type locality, Falotta, Tinizong, Oberhalbstein, Albula Valley, Grisons, Switzerland, grischunite occurs as an alteration product of sarkinite, with which it is intimately intergrown, in a manganese deposit. Associated minerals include sarkinite, brandtite, manganoan berzeliite, tilasite, rhodochrosite and braunite (AM 71: 227-228).
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