Sicherite
Sicherite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula TlAg₂(As,Sb)₃S₆.
It crystallizes in the orthorhombic crystal system (space group Pmnb).
Key properties: Mohs hardness 3; specific gravity 5.26; Dark brown-red streak; Metallic luster.
IMA symbol Sic, IMA status: approved, named in 1997.
Found in cavities in dolomitic rock; the product of late-stage Tl-As-bearing hydrothermal solutions during metamorphism.
It is found associated with Realgar, hutchinsonite, hatchite, jentschite.
The mineral was named to honor Valentin Sicher (b. 1925).
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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