mineral

Tumbled milky quartz pebble

Quartz (SiO₂), likely milky quartz

AI-generated identification · may be incorrect

White to cream, translucent, with a vitreous-to-waxy luster and no visible cleavage; Mohs hardness 7, hexagonal crystal structure, and specific gravity about 2.65. Rounded edges indicate natural abrasion or tumbling.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or metamorphic fluids; milky appearance comes from microscopic fluid inclusions and fractures. Its exact geological age and source cannot be determined from the image.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive polished pieces are inexpensive décor or teaching specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to persist as rounded stream or beach pebbles.

Field identification & locations

Identify by its hardness, pale translucent appearance, conchoidal fracture, and inability to scratch it with a steel knife while potentially scratching glass. Common worldwide, especially in quartz veins, granitic terrains, and river gravels.