mineral

Tumbled milky quartz pebble

Quartz (SiO₂), likely milky quartz

AI-generated identification · may be incorrect

White to translucent, glassy/vitreous luster with a rounded polished surface; hardness 7 Mohs, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65.

Identified August 11, 2026More mineral →

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Physical properties

White to translucent, glassy/vitreous luster with a rounded polished surface; hardness 7 Mohs, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65.

Formation & geological history

Forms when silica-rich fluids fill fractures and crystallize, commonly in hydrothermal veins and igneous rocks; its exact geological age cannot be determined from the photograph.

Uses & applications

Used as an inexpensive lapidary and decorative stone, in jewelry, carvings, countertops, and industrial silica products. Typical small tumbled pieces have minimal monetary value.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light; quartz is one of Earth’s most abundant minerals.

Field identification & locations

Common worldwide, especially in quartz veins, granite-associated rocks, and river gravels. Identify by its hardness, glassy luster, lack of cleavage, and inability to scratch it with a steel nail; the image alone cannot exclude white calcite or glass.