Luanshiweiite
Luanshiweiite is an IMA-recognized mineral species in the silicate class, with the chemical formula KLiAl₁.₅(Si₃.₅Al₀.₅)O₁₀(OH)₂.
It is a member of the Mica structural group.
Key properties: Mohs hardness 3; specific gravity 2.851; optically biaxial.
IMA symbol Lsw, IMA status: approved, named in 2011.
Found in veinlets cutting and the outer zone of a granitic pegmatite dike.
It is found associated with Quartz, an "F-dominant analog of luanshiweiite", montebrasite, pollucite, bismutotantalite, Na- and Ca-poor but Li- and OH- or F-rich tourmaline, tantalite.
The mineral was named to honor Chinese pegmatitic petrologist Professor Luanshiwei (1928-2012).
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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