mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, rounded by tumbling or water abrasion; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal structure, specific gravity about 2.65.

Identified September 16, 2026More mineral →

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Physical properties

White to translucent, vitreous-to-waxy luster, rounded by tumbling or water abrasion; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal structure, specific gravity about 2.65.

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky color results from microscopic fluid inclusions or fractures. Quartz is widespread from Precambrian rocks to modern sediments.

Uses & applications

Used as a lapidary and decorative stone, jewelry component, counter material, glass and silicon source, and industrial abrasive; this small tumbled specimen has modest collector value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. The rounded shape indicates human tumbling or natural stream/beach abrasion.

Field identification & locations

Identify it by its glassy sheen, hardness sufficient to scratch ordinary glass, lack of cleavage, and white translucent appearance; common worldwide in quartz veins and gravel deposits.