mineral

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous to pearly luster, white to translucent color, hexagonal crystal structure, and no true cleavage; fracture is conchoidal. The crystals show prismatic forms with pyramidal terminations, though surfaces appear weathered or coated.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids in veins, cavities, and pegmatites, or from sedimentary void-filling processes. The specimen’s exact geological age cannot be determined from the image and depends on its locality.

Uses & applications

Used for glass, ceramics, electronics, abrasives, and engineered stone; attractive clusters are sold as décor and mineral specimens. This appears to be a common commercial-grade specimen rather than gem-quality material.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or mineral impurities scattering light. Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many metamorphic rocks.

Field identification & locations

Identify it by hardness, glassy luster, six-sided prisms, lack of cleavage, and inability to be scratched by a steel knife; it should scratch ordinary glass. Common localities include Brazil, Madagascar, China, Morocco, and the United States.