Amblygonite

Name:
Amblygonite
Detailed information:

M Formula:	Li(AlF)PO4 or AlPO4•LiF
Properties:
White to grayish-white. Contains up to 10.1% lithia, sometimes with partial replacement by sodium. D 3.01–3.09, Mohs hardness 6.
Occurrence:
California, Maine, Connecticut, South Dakota, Germany, Norway, France.
Use:
A source of lithium used in glazes and coatings.