mineral

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-greasy luster with irregular fracture and no obvious cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The granular, fibrous-looking surface may reflect intergrown quartz crystals or minor alteration.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids precipitate in veins, cavities, and fractures, or crystallizes from igneous melts; quartz is common from Precambrian rocks to the present. The specimen likely comes from a hydrothermal vein or quartz-rich rock.

Uses & applications

Used in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces are collected or polished for ornaments. Milky quartz has modest jewelry value compared with clear or exceptionally formed quartz.

Geological facts

Its cloudiness commonly results from microscopic fluid inclusions, fractures, or mineral impurities. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify by its hardness— it scratches ordinary glass—lack of cleavage, light color, and conchoidal-to-uneven fracture; it should not fizz in dilute acid. Common worldwide, especially in quartz veins and pegmatites.