Cualstibite

cualstibite

cornwallite

arsenogoyazite

baryte

Images

Formula: Cu₂Al(OH)₆[Sb(OH)₆]
Hydroxide, cualstibite group, hydrotalcite supergroup, antimony-bearing mineral
Crystal System: Trigonal
Specific gravity: 3.18 measured, 3.25 calculated
Hardness: 2
Streak: Bluish white
Colour: Blue-green
Luminescence: Not fluorescent under UV
Environments

Hydrothermal environments

Localities

At the type locality, the Clara mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany, cualstibite occurs as a secondary mineral from oxidation of the hydrothermal polymetallic baryte – fluorite deposit. Associated minerals include cornwallite, arsenogoyazite, goethite, baryte, fluorite and quartz (HOM).

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