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 gem here has been cut from a massive granular material and shows a nice purple color.From Brazil.
Size: 13.1x10x7.9 mm.
Weight: 6.79 ct.