mineral

Clear quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Small translucent, colorless-to-cloudy specimen with a vitreous luster; likely quartz or milky quartz. Hardness is 7 Mohs, no true cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or metamorphic processes; its exact age and formation environment cannot be determined from the photograph. Rounded edges suggest natural abrasion or tumbling.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive clear pieces are collected or used as inexpensive ornaments.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge when mechanically stressed.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal breakage, and ability to scratch ordinary glass. Similar-looking glass may show bubbles, flow lines, or lower hardness; common worldwide, especially in veins, granite, pegmatites, and river gravels.