mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to gray, opaque and vitreous to slightly greasy; Mohs hardness 7, with no cleavage and irregular fracture. The specimen appears massive and granular rather than showing distinct crystals.

Identified October 6, 2026More mineral →

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Physical properties

White to gray, opaque and vitreous to slightly greasy; Mohs hardness 7, with no cleavage and irregular fracture. The specimen appears massive and granular rather than showing distinct crystals.

Formation & geological history

Forms when silica-rich fluids fill fractures or crystallize in veins, and also occurs in igneous and metamorphic rocks. Quartz is found in rocks of many ages; this hand specimen’s age cannot be determined from the image.

Uses & applications

Used as a source of silica for glass and industrial materials; attractive pieces are collected or used decoratively.

Geological facts

Milky appearance comes from microscopic fluid or gas inclusions that scatter light.

Field identification & locations

Identify by its glassy sheen, hardness (scratches ordinary glass), and lack of cleavage; common worldwide in quartz veins and granite. The image is consistent with massive milky quartz, though visual identification is not definitive.