Tillmannsite
Tillmannsite is an IMA-recognized mineral species in the vanadate class, with the chemical formula HgAg₃(VO₄).
It crystallizes in the tetragonal crystal system (space group I-4).
Key properties: specific gravity 7.769; Brownish red streak; Adamantine luster; optically uniaxial.
IMA symbol Till, IMA status: approved, named in 2001.
Supergene product in the oxidized zone of a copper deposit hosted in dolomite, calcite, and aragonite.
It is found associated with Pecoraite, vésigniéite, olivenite, kolfanite, janggunite, chlorargyrite, cuprite, native copper, native silver, domeykite, djurleite, algodonite.
The mineral was named to honor Ekkhart Tillmanns (b. 1941) of the Institute of Mineralogy and Crystallography, Vienna, Austria.
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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