mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, trigonal crystal structure, no cleavage, conchoidal fracture, specific gravity about 2.65. The smooth shape is mechanically tumbled; yellow-brown surface material may be iron-oxide staining or adhering matrix.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, commonly in igneous and metamorphic rocks; most quartz formed over broad Precambrian-to-young geological intervals. Natural abrasion and tumbling produced the rounded form.

Uses & applications

Used for glass, electronics, abrasives, countertops, and ornamental stones; attractive milky quartz is sold for crafts and inexpensive mineral collections.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify by its glassy/waxy surface, hardness sufficient to scratch ordinary glass, lack of cleavage, and white translucency; common worldwide, especially in quartz veins, river gravels, and pegmatites.