mineral

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Milky-white to translucent, rounded and smoothly worn; vitreous to subtly frosted luster, hardness 7 Mohs, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Likely natural quartz weathered from quartz-rich igneous or metamorphic rock and rounded by stream or beach abrasion; the image alone cannot establish geological age. Its uniform shape may also indicate commercial tumbling.

Uses & applications

Used in glass and ceramics, electronics, abrasives, engineered stone, and as a decorative or lapidary material; translucent pieces may be used in inexpensive jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. The cloudy appearance generally comes from microscopic fluid inclusions or fractures.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, scratch resistance, and conchoidal fracture; it should scratch ordinary glass but not be scratched by a steel knife. Common worldwide, especially in quartz veins, granite, pegmatite, sandstone, and river gravels.