mineral

Tumbled quartz (likely milky/clear quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to clear, with vitreous luster and conchoidal fracture. Trigonal crystal structure; cleavage absent or very poor, though this piece is polished/tumbled and has internal fractures or inclusions.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, and sedimentary veins; most specimens formed over millions of years. The rounded shape is human-produced by tumbling and polishing.

Uses & applications

Used for ornaments, lapidary items, countertops, abrasives, glass, electronics, and watch oscillators; this small piece has mainly decorative or collecting value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. The milky appearance commonly results from microscopic fluid inclusions or fractures.

Field identification & locations

Identify by its glassy luster, translucency, lack of cleavage, and inability to scratch it with a steel knife; it should scratch ordinary glass. Common worldwide, especially in Brazil, Madagascar, Arkansas, and Alpine veins.