mineral

Milky quartz

Quartz (silicon dioxide, SiO₂); likely a massive vein-quartz specimen

AI-generated identification · may be incorrect

White and opaque with a vitreous-to-dull luster and irregular fracture; quartz has Mohs hardness 7, a hexagonal crystal structure, no cleavage, and specific gravity about 2.65. The image shows a rough, blocky specimen; individual crystal faces are not apparent.

Identified October 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill fractures and crystallize, or during cooling of silica-rich melts. Quartz veins occur in rocks of many ages, so the specimen’s age and precise formation setting cannot be determined from the image.

Uses & applications

Commonly collected and used as a source of silica for glass, ceramics, and industrial applications; attractive, clear pieces may be cut or polished for decoration and jewelry.

Geological facts

Milky opacity typically results from microscopic fluid or gas inclusions that scatter light.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, and ability to scratch glass; common worldwide in veins and pegmatites. This image does not establish locality or specimen quality.