5-Earth Science-Mineral-Kinds-Silicates-Cyclosilicate-Tourmaline

tourmaline

(Na,Ca)(Li,Mg,Fe,Al)3(Al,Fe)6B3Si6O27(O,OH,F)4 [3, 6, and 27 are subscripts] {tourmaline}| is aluminum and iron cyclosilicate and commonly is schorl.

schorl

Tourmaline commonly is a black mineral {schorl}.

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Date Modified: 2022.0225