mineral
Tourmaline in Matrix
Schorl (complex boro-silicate) in quartz-feldspar matrix
AI-generated identification · may be incorrectHardness 7 to 7.5 on Mohs scale; black to dark brown color; vitreous luster; trigonal crystal system with striated prismatic columns; distinct conchoidal fracture.
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Physical properties
Hardness 7 to 7.5 on Mohs scale; black to dark brown color; vitreous luster; trigonal crystal system with striated prismatic columns; distinct conchoidal fracture.
Formation & geological history
Formed in pegmatites and hydrothermal veins through high-temperature crystallization from cooling magma rich in volatiles.
Uses & applications
Used as mineral specimens for collectors, jewelry, and in piezoelectric applications.
Geological facts
Tourmaline displays strong pleochroism and can carry an electrical charge when heated or compressed.
Field identification & locations
Identified by its characteristic prismatic crystal shape, deep striations, and lack of good cleavage; commonly found worldwide in pegmatite-rich regions.
