Mineral
Quartz with Tourmaline Inclusions (Tourmalinated Quartz)
SiO2 with complex borosilicate inclusions
Hardness: 7 (Mohs scale) for quartz, color: clear to milky white with black needle-like inclusions, luster: vitreous, crystal structure: trigonal.
- Luster
- vitreous, crystal structure: trigonal
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Physical properties
Hardness: 7 (Mohs scale) for quartz, color: clear to milky white with black needle-like inclusions, luster: vitreous, crystal structure: trigonal.
Formation & geological history
Formed in pegmatites and hydrothermal veins where quartz and tourmaline crystallize together.
Uses & applications
Used in inexpensive jewelry, ornamental carvings, and by collectors.
Geological facts
The black needles are usually schorl, a type of tourmaline.
Field identification & locations
Identify by the presence of dark, needle-like crystals embedded within a harder, often transparent or translucent quartz matrix.
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