mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, glassy-to-greasy luster, with irregular fracture and no cleavage; hardness 7 Mohs. Trigonal crystal structure, though crystal form is not visible in this rough specimen.

Identified October 14, 2026More mineral →

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Physical properties

White to translucent, glassy-to-greasy luster, with irregular fracture and no cleavage; hardness 7 Mohs. Trigonal crystal structure, though crystal form is not visible in this rough specimen.

Formation & geological history

Forms when silica-rich fluids crystallize in veins and cavities, or during igneous and metamorphic processes. Quartz is common in rocks of many geological ages.

Uses & applications

Used as a silica source in glass and ceramics, and as a decorative or lapidary material; attractive pieces are collected or fashioned into jewelry.

Geological facts

The cloudy appearance results from microscopic fluid or gas inclusions and internal fractures.

Field identification & locations

Common worldwide, including in quartz veins, granites, and metamorphic rocks. Identify by hardness (scratches glass), lack of cleavage, and glassy fracture; this small rough piece is typically worth about $1–$10 USD.