Ore deposit type: Magmatic-hydrothermal, greisen-type
Provenance: Altenberg, Osterzgebirge, Germany
Description: Granofelsic rock composed by an aggregate of cassiterite (brown, adamantine luster), quartz (white-gray, anhedral, but locally forming prismatic crystals; 50 vol%), Li-mica (37 vol%), and topaz (yellowish-green, anhedral; 12 vol%). The measured grade is 0.6 wt% SnO2.