is Potassium lithium aluminum silicate hydroxide fluoride with formula: KLi2Al(Al, Si)3O10(F, OH)2 and hardness of 2-5.
Is an ancommon mica with a good content of lithium and is not easy to identify and separate from muscovite. This quality here is of very high grade with excellent translucency and as far as I know nobody has ever tried to facet it before,this material splint like papers and altough this problem the final result is really nice! From Brazil
Size.: 22.2x14.2x8.6 mm.
Weight: 18.69 ct.