Dreyerite
Dreyerite is an IMA-recognized mineral species in the vanadate class, with the chemical formula Bi(VO₄).
It crystallizes in the tetragonal crystal system (space group I4_1/amd). It is a member of the Zircon structural group.
Key properties: Mohs hardness 2–3; specific gravity 6.25; Yellow streak; Adamantine luster; optically uniaxial.
IMA symbol Dye, IMA status: approved, named in 1978.
Found in rhyolitic tuffs, intercalated with carbonaceous matter and silicified wood.
It is found associated with Bismite, mixite, carnotite, silver, chlorargyrite, kaolinite, hematite, goethite, barite, quartz.
In honor of Gerhard Dreyer, Assistant Professor, Johannes Gutenberg University, Mainz, Germany, who found the mineral.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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