Tourmaline

complex borosilicate
(Na, Ca)(Li, Mg, Al)(Al, Fe, Mn)6 -
(BO3)3(Si6O18)(OH)4

green & pinks crystals (variety elbaite) in albite/quartz matrix (photo courtesy of Amethyst Galleries, Inc.) slender black crystals (variety schorl) in mica matrix (photo courtesy of Amethyst Galleries, Inc.)

Diagnostic properties:


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