mineral

Milky quartz (likely quartz-rich specimen)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and trigonal crystal structure. The specimen appears rough and massive, though its irregular form makes identification uncertain from the image alone.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; milky color results from microscopic fluid inclusions. Quartz spans much of Earth’s geologic history and is common in many environments.

Uses & applications

Used in glass, ceramics, electronics, abrasives, countertops, and ornamental specimens; attractive pieces may be sold as mineral collectibles.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky quartz is distinguished from calcite by its greater hardness and lack of cleavage.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and alpine regions. A steel file should not scratch it; vinegar or weak acid should not visibly fizz, unlike calcite.