Brown crystal aggregates of the very rare Li-Be silicate mineral liberite from the type locality in China (Xianghualing Mine, Linwu County, Chenzhou, Hunan Province, China), and associated to white hsianghualite. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium — Photo: David Hospital · CC BY-SA 4.0
Liberite
Liberite is an IMA-recognized mineral species in the silicate class, with the chemical formula Li₂Be(SiO₄).
It crystallizes in the monoclinic crystal system (space group Pn).
Key properties: Mohs hardness 7; specific gravity 2.688; Oily, vitreous on cleavages luster; optically biaxial.
IMA symbol Lbr, IMA status: approved, named in 1964.
Found in veins cutting a lepidolite-fluorite-magnetite \ribbon ro ck" in tactite.
It is found associated with Lepidolite, natrolite, eucryptite, hsianghualite, cassiterite, scheelite.
Presumably for LIthium and BERyllium in the composition.