Ellisite
Ellisite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Tl₃AsS₃.
It crystallizes in the hexagonal crystal system (space group R3m).
Key properties: specific gravity 7.1; Pale brown with a tinge of orange streak; Metallic luster.
IMA symbol Els, IMA status: approved, named in 1977.
Found in a hydrothermal gold deposit, in mineralized, argillaceous, carbonaceous dolostone beds.
It is found associated with Gold, pyrite, christite, lorandite, getchellite, realgar, arsenic, carlinite, hydrocarbons.
The mineral was named to honor Dr. Albert J. Ellis (1929–), New Zealand geochemist, Chemistry Division, Department of Scientific and Industrial Research, New Zealand.
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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