$Tumbled quartz pebble (Quartz (SiO₂), likely milky or fractured rock crystal) — mineral$

mineral

Tumbled quartz pebble

Quartz (SiO₂), likely milky or fractured rock crystal

AI-generated identification · may be incorrect

Hardness 7 Mohs; pale gray to translucent white, with vitreous luster and irregular internal fractures. Quartz is trigonal and lacks cleavage, showing conchoidal fracture; specific gravity is about 2.65.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or metamorphic processes; this specimen appears naturally worn or lightly tumbled. Its precise geological age and source cannot be determined from the photograph.

Uses & applications

Used in glass, ceramics, electronics, abrasives, and jewelry; attractive tumbled pieces are sold as inexpensive specimens or lapidary material.

Geological facts

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

Field identification & locations

Identify it by its glassy appearance, translucent edges, hardness, and lack of cleavage; it should scratch ordinary glass but not be scratched by a steel knife. Common worldwide, especially in granitic and hydrothermal regions.