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Formula: Bi(AsO4)
Anhydrous normal arsenate of bismuth,
tetragonal paramorph of monoclinic
rooseveltite
Crystal System: Tetragonal
Specific gravity: 7.64 calculated
Hardness: 2½
Streak: White
Colour: White to yellowish-white
Common impurities: P
Environments
Tetrarooseveltite is a very rare mineral that to date (December 2025) has been found only at the type locality.
Localities
At the type locality, the Moldava deposit, Moldava, Teplice District, Ústí nad Labem Region, Czech Republic,
tetrarooseveltite is a rare secondary mineral in vugs in
an oxidised
fluorite–baryte–quartz
vein. Associated minerals include bayldonite,
malachite, mimetite,
fluorite, quartz,
preisingerite, zavaritskite,
bismutite, rooseveltite,
mixite and wulfenite
(HOM, Dana).
Tetrarooseveltite from the Moldava Deposit -
Image
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