mineral

Tumbled milky quartz

Quartz (SiO₂), likely massive milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent cream-to-gray color with a vitreous-to-waxy luster and no visible cleavage. It has a trigonal crystal structure, though tumbling obscures crystal faces; specific gravity is about 2.65.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill fractures and crystallize, commonly in igneous and metamorphic environments. Quartz is widespread and ranges from Precambrian to modern in age; this piece has been mechanically polished and rounded.

Uses & applications

Used as an inexpensive ornamental stone, polished pebble, craft material, and collector specimen; quartz also has major industrial uses in glass, electronics, and ceramics.

Geological facts

The cloudy appearance comes from microscopic fluid inclusions, fractures, or fine mineral impurities. Quartz is among Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify it by its glassy sheen, lack of cleavage, pale translucency, and ability to scratch ordinary glass; a steel blade should not scratch it. Common sources include Brazil, Madagascar, the United States, and many quartz-bearing regions.