mineral

Quartz crystal cluster

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

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous luster, white to translucent appearance, and a hexagonal crystal structure; quartz has no true cleavage and uneven to conchoidal fracture. The specimen appears as a rough cluster of intergrown crystals with some iron-oxide staining.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids cool in cavities, veins, or fractures, allowing crystals to grow over rock surfaces. Its exact geological age and locality cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive clusters are sold as display specimens and occasionally used in decorative work.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of many geodes and mineral veins. Crystal tips and translucency generally increase specimen appeal.

Field identification & locations

Identify it by its glassy luster, hardness, lack of cleavage, and six-sided crystal faces; it should scratch ordinary glass but not be scratched by a steel knife. Common sources include Brazil, Arkansas, Madagascar, Morocco, and many hydrothermal vein regions.