Leguernite
Leguernite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Bi₁₂.₆₇O₁₄(SO₄)₅.
It crystallizes in the monoclinic crystal system (space group P2).
Key properties: specific gravity 7.375; White streak; Subadamantine luster.
IMA symbol Lg, IMA status: approved, named in 2013.
A sublimate on volcanic rock from the walls of a high-temperature fumarole.
It is found associated with Anglesite, balićžunićite, lillianite, galenobismutite, bismoclite, Cd-rich sphalerite, Cd-rich wurtzite, pyrite, pyrrhotite.
The mineral was named to honor François Le Guern (1942-2011), better known as “Fanfan, ” a volcanologist and expert on volcanic gases and sublimates.
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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