mineral

Tumbled quartz (likely clear/milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; transparent to translucent, colorless to pale smoky/cream, with a vitreous luster and conchoidal fracture. The rounded shape is mechanically tumbled and polished; crystal structure is trigonal, with no cleavage and specific gravity about 2.65.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids, with specimens ranging from Precambrian to recent formations. This piece was likely cut from quartz-rich material and rounded in a tumbler.

Uses & applications

Used for gemstones, carvings, metaphysical décor, abrasives, glass, electronics, and precision oscillators. Small tumbled pieces are primarily sold as inexpensive collectibles.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of many sandstones and granites. A true quartz specimen should resist scratching by ordinary steel but can scratch glass.

Field identification & locations

Common worldwide, especially in Brazil, Madagascar, the United States, and alpine or hydrothermal districts. Confirm with a hardness test and conchoidal fracture; visual identification is somewhat uncertain because the image shows a small polished bead.