Sbacchiite
Sbacchiite is an IMA-recognized mineral species in the halide class, with the chemical formula Ca₂AlF₇.
It crystallizes in the orthorhombic crystal system (space group Pnma).
Key properties: specific gravity 3.08; White streak; Vitreous luster; optically biaxial.
IMA symbol Scc, IMA status: approved, named in 2018.
Found as a high-temperature encrustation formed by the extraction of aluminum and calcium from the underlying rocks by HF activity around a volcanic fumarole.
It is found associated with Gearsksutite, usovite, creedite, opal.
The mineral was named to honor Dr. Massimo Sbacchi (b. 1958), biologist and mineral collector, for his long-time field collaboration and continuous supply of interesting material for study.
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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