mineral

Quartz-rich rock fragment (likely milky quartz)

Quartz, SiO₂; exact rock identification is uncertain from the image

AI-generated identification · may be incorrect

Small, rough, whitish to translucent fragment with a glassy-to-dull luster and irregular fracture. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65.

Identified October 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms as crystals in silica-rich veins and cavities or as grains in many rocks; it occurs in rocks of many geological ages. The fragment’s source and age cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and decorative objects; attractive clear pieces are used in jewelry and collecting.

Geological facts

Quartz is one of Earth’s most abundant minerals and breaks with a curved, shell-like (conchoidal) fracture rather than along cleavage planes.

Field identification & locations

The pale, uneven surface is consistent with quartz, but a hardness or streak test and closer inspection would help distinguish it from other light-colored rocks. Quartz occurs worldwide in veins, pegmatites, and sedimentary deposits.