mineral

Quartz Druse on Basalt Matrix

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

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

Identified July 27, 2026More mineral →

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Physical properties

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.