mineral

Milky quartz pebble

Quartz, SiO₂ (microcrystalline to crystalline variety)

AI-generated identification · may be incorrect

White to translucent, with a glassy-to-waxy luster and irregular fracture; Mohs hardness 7, no cleavage, trigonal crystal system. The image shows a small, rounded, possibly polished specimen.

Identified October 4, 2026More mineral →

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Physical properties

White to translucent, with a glassy-to-waxy luster and irregular fracture; Mohs hardness 7, no cleavage, trigonal crystal system. The image shows a small, rounded, possibly polished specimen.

Formation & geological history

Quartz forms as silica-rich fluids crystallize in veins and cavities, or as grains in many rock types; it occurs in rocks spanning much of Earth’s geological history.

Uses & applications

Commonly used for ornaments, carvings, jewelry, and as a source of silica for glass and other industrial products.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.

Field identification & locations

Its hardness, lack of cleavage, and glassy luster help distinguish it; check for a scratch on glass and avoid relying on color alone. Quartz is found worldwide, especially in veins and pegmatites.