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Formula: Bi(VO4)
Anhydrous normal vanadate, paramorph of
clinobisvanite and
pucherite; dreyerite is the rarest of the three
paramorphs
(Mindat)
Specific gravity: 6.25 calculated
Hardness: 2 to 3
Streak: Yellow
Colour: Orange-yellow, brownish-yellow
Environments
Dreyerite occurs in rhyolitic
tuff, intercalated with carbonaceous matter and silicified wood, and
associated with bismite, mixite,
carnotite, silver,
chlorargyrite, kaolinite,
hematite, goethite,
baryte and quartz
(HOM).
At the type locality, Hirschhorn, Otterbach-Otterberg, City of Kaiserslautern, Rhineland-Palatinate,
Germany, dreyerite occurs in plates up to 0.5 mm in diameter in
rhyolitic
tuff, associated with quartz,
baryte, hematite,
native silver, bismite and
carnotite
(AM 67.622).
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