mineral
Tourmaline in Muscovite
(Na,Ca)(Al,Fe,Li)(Al,Mg,Mn)6(BO3)3Si6O18(OH)4 embedded in KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectHardness of 7.0 for tourmaline and 2.0-2.5 for muscovite. Features prismatic black tourmaline crystals contrasted with silvery-white, flaky muscovite mica sheets.
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Physical properties
Hardness of 7.0 for tourmaline and 2.0-2.5 for muscovite. Features prismatic black tourmaline crystals contrasted with silvery-white, flaky muscovite mica sheets.
Formation & geological history
Formed in pegmatites through the crystallization of magma rich in water and volatile elements under high pressure.
Uses & applications
Prized by mineral collectors as aesthetic display specimens and used scientifically in piezoelectric applications.
Geological facts
Tourmaline exhibits strong pleochroism and pyroelectricity, meaning it can generate an electrical charge when heated.
Field identification & locations
Easily identified by the stark contrast between striated black prismatic crystals and the micaceous, pearly matrix.
