Lepidolite, K(Li,Al)3(Si,Al)4O10(F,OH)2, has a monoclinic crystal system with a platy habit.
Highlighting FeaturesPlane of Si atoms Silica tetrahedral layer Plane of Al atoms Lithium (Li) atoms in octahedral coordination sites All atoms
This clear purple mineral is used ornamentally and can be found in Czechoslovakia, U.S, Madagascar, Italy, Canada and Australia.
Guggenheim, S. 1981. Cation ordering in lepidolite type 1M from Radkovice. American Mineralogist. 66: 1221-1232.