mineral

Tumbled quartz (likely milky or included quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent gray-white to brownish body with a vitreous luster and irregular internal veils or fractures. Quartz is trigonal and lacks cleavage, showing conchoidal fracture; the rounded shape is from tumbling.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, and sedimentary veins; the specimen may be derived from quartz vein material and has been mechanically polished. Its precise geological age cannot be determined from the photograph.

Uses & applications

Common quartz is inexpensive and widely used in glass, ceramics, abrasives, electronics, and engineered stone; attractive tumbled pieces are sold as decorative or metaphysical stones.

Geological facts

The internal cloudy patterns are commonly fluid inclusions, healed fractures, or fine mineral inclusions rather than distinct banding. Quartz is one of Earth’s most abundant crustal minerals.

Field identification & locations

Identify it by its glassy luster, lack of obvious cleavage, hardness sufficient to scratch ordinary glass, and resistance to scratching by a steel knife. Common worldwide, especially in quartz veins and granitic or metamorphic terrains.