mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂), cryptocrystalline-to-coarse crystalline aggregate

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, irregular fracture, no obvious cleavage; Mohs hardness 7 and specific gravity about 2.65. The cloudy appearance comes from microscopic fluid inclusions and structural defects.

Identified September 12, 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; individual specimens may range from Precambrian to younger geological ages. The rounded shape indicates stream or beach transport, or deliberate tumbling.

Uses & applications

Used as a durable ornamental stone, lapidary material, countertops, and a source of silica; attractive pieces may be used in carvings or inexpensive jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky quartz is generally less transparent and less valuable than clear rock crystal or gem-quality varieties.

Field identification & locations

Identify it by its white translucency, glassy sheen, hardness sufficient to scratch ordinary glass, and lack of cleavage; common worldwide, especially in quartz veins and river gravels. A field test should avoid damaging valuable specimens.