mineral

Milky quartz (rough quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Opaque white to pale gray with a vitreous-to-dull luster and irregular fracture; quartz has a hexagonal crystal structure, Mohs hardness 7, no cleavage, and specific gravity about 2.65. The photo does not show diagnostic crystal faces, so identification is based on appearance.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as quartz in a vein or pegmatite from silica-rich fluids cooling in cracks in host rock; quartz occurs from ancient to recent geological settings. Its exact age and origin cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and construction aggregate; attractive pieces are collected or occasionally used in crafts and jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under mechanical stress.

Field identification & locations

Check for hardness: quartz can scratch ordinary glass and should not be scratched by a steel knife. Common worldwide in veins, igneous rocks, and metamorphic rocks; confirmatory testing may be needed to distinguish it from other white minerals.