mineral

Tumbled milky quartz (probable)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, smooth water-worn/tumbled surface, vitreous to waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal system, specific gravity about 2.65. The photograph cannot confirm hardness or composition, so white calcite or chalcedony remain alternatives.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and hydrothermal environments when silica crystallizes; milky appearance results from microscopic fluid inclusions and defects. Quartz is geologically widespread and may be any age.

Uses & applications

Used as an ornamental tumbled stone, in jewelry and collections; quartz is also important industrially in glass, ceramics, electronics, and engineered stone.

Geological facts

A steel knife should not scratch quartz, while quartz can scratch ordinary glass. Vinegar generally does not react with quartz but may fizz on calcite.

Field identification & locations

The rounded, uniformly polished shape suggests a commercial tumbled specimen rather than a natural local fragment. Quartz is plausible near 31.7°N, 116.6°W, where granitic and metamorphic rocks occur, though exact provenance cannot be determined visually.