Dreyerite

minerals

mixite

carnotite

clinobisvanite

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

Volcanic Igneous 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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