mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to cream, with a vitreous-to-waxy luster and indistinct cleavage. It has a hexagonal crystal structure, though this piece is rounded and likely naturally weathered or tumbled.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in igneous or metamorphic rocks, commonly in veins; its exact geological age cannot be determined from the image. The cloudy appearance results from microscopic fluid inclusions or fractures.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces are collected or used decoratively, but this specimen is not gem-grade.

Geological facts

Quartz is one of Earth’s most abundant and chemically resistant minerals. Milky quartz commonly survives erosion and accumulates in stream gravels and soils.

Field identification & locations

Identify it by its glassy appearance, lack of obvious cleavage, irregular conchoidal fracture, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in quartz veins and granitic or metamorphic terrains.