Big pink flake of lepidolite mica from hybrid LCT-NYF pegmatite in Høydalen, Norway. Size 6.5 x 3.5 cm. — Photo: Zbynek Burival · CC BY-SA 4.0
Trilithionite
Also known as: Lepidolite.
The lithium-aluminium end-member of the lepidolite mica series — a pale violet mica of lithium pegmatites.
Intro adapted from Wikipedia (CC BY-SA).
Trilithionite is an IMA-recognized mineral species in the silicate class, with the chemical formula KLi₁.₅Al₁.₅(Si₃Al)O₁₀F₂.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Mica structural group.
Key properties: Mohs hardness 2.5–3; typically purple or pink or gray; white streak; vitreous luster.
IMA symbol Tln, IMA status: approved, named in 1998.
Collections: Collector Favorites.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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