Bill Bagley Minerals

Bill Bagley Rocks and Minerals

Minerals / Tourmaline, schorl var.

Tourmaline is a crystalline boron silicate mineral,  Na(Li,Al,Mg,Mn,Fe)Al6(BO3)3 Si6O18(OH)4 This black variety is the most common, over 90%, and is called schorl variety. The crystals are prismatic in the trigonal system, and are intermixed with feldspar. The specimen is from Minas Gerais, Brazil.  

Tourmaline, schorl var. Bill Bagley Rocks and Minerals



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