mineral

Quartz cluster, possibly druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain

AI-generated identification · may be incorrect

White to gray, sugary granular crystals with a vitreous to slightly dull luster; Mohs hardness 7, trigonal crystal structure, no cleavage, conchoidal fracture, specific gravity about 2.65. Exact identification is limited by the photograph.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly precipitates from silica-rich hydrothermal fluids in cavities, fractures, and veins, often coating older rock; formation may range from Precambrian to recent. The darker supporting material is likely weathered host rock or another mineral.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive clusters are sold as display specimens. This piece has modest decorative and collecting value.

Geological facts

The granular surface may be druzy quartz, composed of many tiny quartz crystals. Quartz is one of Earth’s most abundant minerals and is resistant to chemical weathering.

Field identification & locations

Identify by its hardness, glassy sparkle, lack of cleavage, and inability to scratch it with a steel knife; a streak test should be white. Common sources include hydrothermal veins and geodes worldwide, especially Brazil, Morocco, and the United States.