mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂), massive variety

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, irregular fracture, and no obvious cleavage; Mohs hardness 7 and specific gravity about 2.65. The rounded shape indicates water abrasion, while brown surface staining is likely iron-oxide residue or weathering.

Identified August 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, commonly in igneous, metamorphic, and hydrothermal environments. Its original formation may be Precambrian to recent, but the pebble’s transport and rounding are much younger.

Uses & applications

Used for silica, glass, ceramics, abrasives, and ornamental stone; attractive pieces may be used in crafts or inexpensive cabochons. This small common specimen has little commercial value.

Geological facts

Milky quartz is cloudy because microscopic fluid inclusions, fractures, or mineral impurities scatter light. Its hardness can scratch ordinary glass and steel, though a polished surface may feel deceptively smooth.

Field identification & locations

Common in stream gravels, quartz veins, granitic terrains, and eroded metamorphic rocks worldwide. Confirm with a glass-scratch test and lack of cleavage; avoid confusing it with calcite, which is softer and reacts with dilute acid.