mineral

White quartz cluster

Quartz (silicon dioxide, SiO₂), likely a drusy or microcrystalline cluster

AI-generated identification · may be incorrect

White, translucent-to-opaque crystals with vitreous luster; Mohs hardness 7, no cleavage, conchoidal fracture, and trigonal crystal structure. The granular coating may reflect microscopic quartz crystals or included chalcedony.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich hydrothermal fluids or groundwater precipitated quartz in cavities and fractures, commonly in volcanic or sedimentary host rocks. The specimen’s precise age and locality cannot be determined from the photograph.

Uses & applications

Used mainly as a decorative and educational specimen; quartz is also important in glass, electronics, abrasives, and engineered stone. Common pieces of this quality have modest collecting value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically identical to rock crystal, amethyst, and citrine; color is controlled by impurities or structural defects.

Field identification & locations

Common worldwide, especially in Brazil, Madagascar, Mexico, the United States, and Arkansas. Identify it by its glassy luster, hardness sufficient to scratch glass, lack of cleavage, and irregular/conchoidal break; a mineral test is needed to distinguish it from white calcite.