Compound arsenate, brackebuschite group
Specific gravity: 6.46
Hardness: 4 to 5
Streak: Light green
Colour: Emerald-green, grass-green, apple-green, pale bluish green
Arsentsumebite is a rare arsenate.
At the Clara mine, Germany, arsentsumebite occurs in a hydrothermal polymetallic baryte - fluorite deposit (Webmin, HOM).
At the type locality, the Tsumeb mine, Oshikoto Region, Namibia, arsentsumebite occurs in the oxidised zone of a dolostone-hosted hydrothermal polymetallic ore deposit, (Webmin, HOM, Mindat). sometimes as a crust of distorted crystals on malachite, (AM 51.258) associated with malachite, cerussite, azurite, smithsonite, mimetite, bayldonite, conichalcite, duftite, quartz and iron oxide (HOM, Mindat). The arsentsumebite is a constituent of massive, arsenate-rich matrix material, and has also been found as pseudomorphs after mimetite (R&M 93.6.540, KL p212).
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