mineral
Tourmaline
Tourmaline Group (Complex Borosilicate)
AI-generated identification · may be incorrectHardness 7-7.5 on Mohs scale. Varies in color, often black (schorl), with vitreous luster and prismatic crystal structure with striated sides.
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Physical properties
Hardness 7-7.5 on Mohs scale. Varies in color, often black (schorl), with vitreous luster and prismatic crystal structure with striated sides.
Formation & geological history
Forms in pegmatites and metamorphic rocks through hydrothermal processes associated with cooling magma.
Uses & applications
Used in jewelry, scientific pressure sensors, and as mineral collector specimens.
Geological facts
Tourmaline exhibits pyroelectricity and piezoelectricity, meaning it generates an electric charge when heated or subjected to mechanical stress.
Field identification & locations
Identify in the field by its distinct triangular cross-section, vertical striations along the prism faces, and lack of cleavage.
