mineral
Quartz Druse on Basalt Matrix
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Clear to milky translucent crystalline quartz with a dark greyish-black basaltic matrix. Luster: Vitreous to glassy crystals on a dull rock base. Crystal System: Trigonal.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to glassy crystals on a dull rock base
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Physical properties
Hardness: 7 on Mohs scale. Color: Clear to milky translucent crystalline quartz with a dark greyish-black basaltic matrix. Luster: Vitreous to glassy crystals on a dull rock base. Crystal System: Trigonal.
Formation & geological history
Formed through hydrothermal deposition where silica-rich fluids precipitated inside cavities or gas vesicles (geodes) within dark volcanic basalt rocks.
Uses & applications
Used primarily for gemstone collections, mineral displays, decorative items, and metaphysical practices.
Geological facts
This type of specimen is often a fragment broken off from the wall of a larger geode, showing the transition from the host volcanic rock matrix to the crystalline interior.
Field identification & locations
Can be identified by the sharp, hexagonal crystalline quartz structures growing directly off a dark basalt host rock. Common in basaltic lava fields in Brazil, Uruguay, and India.
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