Lepidolite

Name:
Lepidolite
Detailed information:

Chemistry name:	lithia mica
M Formula:	K2Li3Al4Si7O21(OH,F)3
Properties:
Pink and lilac to gray color; pearly luster; perfect micaceous cleavage. Mohs hardness 2.5–4, d 2.8–3.0.
Occurrence:
California, South Dakota, New Mexico, South Africa.
Use:
Source of lithium and rubidium, flux in glass and ceramics production.