mineral

Milky quartz pebble

Quartz (SiO₂), massive microcrystalline variety

AI-generated identification · may be incorrect

Hardness 7; white to gray-beige, translucent edges, vitreous to dull luster, and no obvious cleavage. It has a granular, interlocking crystal texture and typical specific gravity near 2.65.

Identified September 11, 2026More mineral →

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Physical properties

Hardness 7; white to gray-beige, translucent edges, vitreous to dull luster, and no obvious cleavage. It has a granular, interlocking crystal texture and typical specific gravity near 2.65.

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, commonly during hydrothermal activity; the specimen’s exact geological age cannot be determined from the image. Surface rounding indicates transport as a pebble or later tumbling/weathering.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, and ornamental objects; attractive pieces are collected but are generally not gem-quality.

Geological facts

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

Field identification & locations

Identify by its glassy fracture, lack of cleavage, hardness sufficient to scratch ordinary glass, and resistance to weathering; avoid confusing it with calcite, which is softer and cleaves readily. Common worldwide in quartz veins, igneous rocks, and gravel deposits.