mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness Mohs 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. The rounded shape indicates mechanical tumbling or water wear.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky appearance comes from microscopic fluid inclusions or fractures. Quartz is found in rocks of nearly all geological ages.

Uses & applications

Common as a decorative tumbled stone, lapidary material, and occasional jewelry component; quartz is also important industrially in glass, ceramics, electronics, and engineered stone.

Geological facts

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

Field identification & locations

Identify it by its white translucency, glassy surface, lack of cleavage, and ability to scratch ordinary glass; common sources include quartz veins, pegmatites, river gravels, and Brazil, Madagascar, and the United States. The image is somewhat out of focus, so confirmation would require hardness and streak tests.