Selenostephanite
Selenostephanite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₅SbSe₄.
It crystallizes in the orthorhombic crystal system (space group P2_12_12_1).
Key properties: Mohs hardness 2.5–3; specific gravity 7.5.
IMA symbol Ssph, IMA status: approved, named in 1982.
Found in quartz and orthoclase-quartz veins with other silver minerals in a volcanogenic Au–Ag deposit.
It is found associated with Miaragyrite, clausthalite, Au–Ag alloy, pyrargyrite, acanthite, clausthalite, naumannite, argyrodite, tetrahedrite–tennantite, pyrite, sphalerite.
The name refers to selenium in the composition, and similarity to stephanite.
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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