mineral
Brown Tourmaline
Dravite, NaMg3Al6(Si6O18)(BO3)3(OH)4
AI-generated identification · may be incorrectHardness of 7 to 7.5 on the Mohs scale, brown to dark brown color, vitreous luster, and trigonal crystal system with prismatic habit.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, brown to dark brown color, vitreous luster, and trigonal crystal system with prismatic habit.
Formation & geological history
Forms in metamorphic rocks like schists and marbles, as well as in granitic pegmatites through hydrothermal processes.
Uses & applications
Used in mineral collections, jewelry, and occasionally as a piezoelectric material in industrial applications.
Geological facts
Dravite is the magnesium-rich endmember of the tourmaline group, named after the Dravan region in Carinthia.
Field identification & locations
Identified by its distinctive striated prismatic crystals and lack of cleavage; commonly found worldwide including Australia, Brazil, and the USA.
