Brownish Lafossaite crystals. Fumarole F 11, La Fossa Caldera, Vulcano Island, Eolian Island, Lipari, Italy. Picture size 4 mm — Photo: Thomas Witzke · CC BY-SA 3.0 de
Lafossaite
Lafossaite is an IMA-recognized mineral species in the halide class, with the chemical formula TlCl.
It crystallizes in the cubic crystal system (space group Pm3m).
Key properties: Mohs hardness 3–4; specific gravity 7.212; Off-white to cream streak; Resinous to greasy luster.
IMA symbol Lfs, IMA status: approved, named in 2003.
By sublimation from fumarolic gas.
It is found associated with Cannizzarite, galenobismutite, pyrite.
The name refers to the locality from which the first specimens were obtained – La Fossa Crater, Italy.
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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