Demicheleite-(I)
Demicheleite-(I) is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula BiSI.
It crystallizes in the orthorhombic crystal system (space group Pnam). It is a member of the Demicheleite structural group.
Key properties: specific gravity 6.411; Brown streak; Submetallic luster.
IMA symbol Dem-I, IMA status: approved, named in 2009.
A product of fumarolic alteration of pyroclastic breccia.
It is found associated with Demicheleite-(Br), bismoclite, bismuthinite, aiolosite, godovikovite, panichiite, brontesite, adranosite.
The mineral was named to honor Vincenzo de Michele (b. 1936), former curator of the Natural History Museum, Milan, Italy, and suffix for its chemical composition.
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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