mineral
Quartz crystal cluster
Quartz, silicon dioxide (SiO₂), likely milky or partially included rock crystal
AI-generated identification · may be incorrectHardness 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.
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Physical properties
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.
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.
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