mineral

Tumbled quartz

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

AI-generated identification · may be incorrect

Mohs hardness 7; translucent gray-white to pale brown, with vitreous to waxy luster and conchoidal fracture. Quartz is trigonal and lacks cleavage; the rounded surface indicates tumbling or natural abrasion.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins, cavities, or igneous rocks; inclusions or weathering may create the cloudy coloration. Quartz occurs from Precambrian to modern geological settings.

Uses & applications

Used for ornamental stones, crystal collecting, abrasives, glass, ceramics, and electronics; this small piece has mainly decorative or educational value.

Geological facts

Cloudiness commonly results from microscopic fluid inclusions, fractures, or intergrown quartz. It can resemble chalcedony, but coarse internal fracture textures suggest quartz rather than uniformly cryptocrystalline material.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and the Alps. Identify it by hardness— it should scratch ordinary glass—and its glassy fracture; avoid testing valuable pieces. The image alone cannot confirm whether it is quartz or a similar silica mineral.