mineral
Black Tourmaline (Schorl)
Schorl (Complex sodium iron aluminum borosilicate)
Hardness: 7-7.5 on Mohs scale. Color: Black. Luster: Vitreous to sub-metallic. Crystal structure: Trigonal, prismatic crystals often with striated faces. Cleavage: Indistinct. Specific gravity: 3.2-3.26.
- Hardness
- 7-7
- Color
- Black
- Luster
- Vitreous to sub-metallic
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Physical properties
Hardness: 7-7.5 on Mohs scale. Color: Black. Luster: Vitreous to sub-metallic. Crystal structure: Trigonal, prismatic crystals often with striated faces. Cleavage: Indistinct. Specific gravity: 3.2-3.26.
Formation & geological history
Forms in igneous and metamorphic environments, particularly in pegmatites, granites, and hydrothermal veins, often crystallizing from cooling magma rich in boron and water.
Uses & applications
Used in metaphysical practices, mineral collecting, jewelry making, and sometimes in industrial applications for its piezoelectric and pyroelectric properties.
Geological facts
Black tourmaline is known as Schorl, which historically was a mining village in Saxony, Germany, where the mineral was found prior to 1400. It is well-known for absorbing negative energy in metaphysical contexts.
Field identification & locations
Easily identified by its characteristic deep black color, vitreous luster, and deeply striated prismatic crystal faces. Found worldwide, with notable deposits in Brazil, Africa, Pakistan, and the USA.
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