mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂), commonly called milky quartz

AI-generated identification · may be incorrect

Small polished, translucent white-gray pebble with a vitreous-to-waxy luster and no visible cleavage. Mohs hardness 7; trigonal crystal structure; specific gravity about 2.65, though the rounded shape obscures crystal form.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when microscopic fluid inclusions, fractures, or defects make otherwise clear quartz cloudy, commonly in hydrothermal veins and igneous rocks. Quartz is geologically widespread and forms from Precambrian to modern environments; this specimen has been tumbled and polished.

Uses & applications

Used as an inexpensive ornamental stone, bead, cabochon, and jewelry component; quartz is also important industrially in glass, ceramics, electronics, and engineered stone.

Geological facts

Milky quartz may become clearer at thin edges or under strong light. Its hardness is sufficient to scratch ordinary glass, but it should not scratch it with certainty if heavily polished or coated.

Field identification & locations

Identify by its white translucency, glassy luster, lack of cleavage, and resistance to scratching; distinguish it from glass by its hardness and typically irregular internal veils. Common worldwide, including Brazil, Madagascar, the United States, and the Alps.