mineral

Milky quartz specimen

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-pearly luster and irregular fracture; Mohs hardness 7, no cleavage, trigonal crystal structure, and specific gravity about 2.65. The rough, sugary texture may reflect intergrown quartz crystals or weathering.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids crystallize in veins, cavities, or pegmatites, generally during igneous or metamorphic activity; its exact geological age cannot be determined from the photograph.

Uses & applications

Used as an ornamental and lapidary material, aggregate, glass and silicon source; attractive pieces are collected, though this specimen appears relatively common.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky coloration results mainly from microscopic fluid inclusions, fractures, or defects scattering light.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, lack of cleavage, and a white translucent appearance; common worldwide, especially in quartz veins and pegmatites.