mineral

Quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely milky or partially included rock crystal

AI-generated identification · may be incorrect

Hardness 7 Mohs; colorless to white and translucent, with vitreous luster and hexagonal prismatic crystals terminated by pyramidal faces. Quartz lacks cleavage and has conchoidal fracture; specific gravity is about 2.65.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Crystals formed when silica-rich hydrothermal fluids or groundwater cooled in cavities and fractures, likely during a host rock’s geological formation; the exact age and locality cannot be determined from the image.

Uses & applications

Used for glass, ceramics, electronics, abrasives, and engineered stone; attractive clusters are sold as decorative and metaphysical specimens.

Geological facts

The visible crystals show quartz’s characteristic six-sided prisms and pointed terminations, though some surfaces may be broken or coated by secondary minerals.

Field identification & locations

Identify by its glassy luster, hexagonal terminations, lack of cleavage, and ability to scratch ordinary glass; common sources include Brazil, Arkansas, Madagascar, China, and Mexico.