mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to cream, translucent to opaque, with a vitreous-to-waxy luster and no cleavage; crystalline structure is trigonal, though tumbling has rounded the specimen.

Identified September 22, 2026More mineral →

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Physical properties

Typically hardness 7 Mohs, white to cream, translucent to opaque, with a vitreous-to-waxy luster and no cleavage; crystalline structure is trigonal, though tumbling has rounded the specimen.

Formation & geological history

Likely quartz vein material formed from silica-rich hydrothermal fluids in igneous or metamorphic rocks; quartz commonly formed from the Precambrian onward and is geologically widespread.

Uses & applications

Used for decorative stone, lapidary work, countertops, glass, abrasives, and electronics; this small polished piece is mainly a craft or collecting specimen.

Geological facts

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

Field identification & locations

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