mineral

Tumbled milky quartz pebble

Quartz (SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent gray, vitreous-to-waxy luster, no visible cleavage, conchoidal fracture, and trigonal crystal structure. Its smoothly rounded shape indicates tumbling or natural water abrasion.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids; milky appearance results from microscopic fluid inclusions or fractures. Quartz formed throughout Earth’s geological history, commonly in veins and pegmatites.

Uses & applications

Used as a low-cost decorative, craft, landscaping, and metaphysical stone; quartz is also important industrially in glass, ceramics, electronics, and abrasives. This small tumbled piece has minimal monetary value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the reference mineral for Mohs hardness 7. The specimen’s uniform smoothness and rounded edges strongly suggest commercial tumbling.

Field identification & locations

Common worldwide in quartz veins, granitic rocks, river gravels, and beaches; major sources include Brazil, Madagascar, the United States, and India. A steel file should not scratch it, while quartz or corundum can scratch it.