mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous luster, indistinct internal fractures, and no visible cleavage; Mohs hardness 7, specific gravity about 2.65. The specimen appears rough and naturally fractured, though exact identification is limited by the image.

Identified August 17, 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; its cloudy appearance commonly results from microscopic fluid inclusions or structural defects. Quartz occurs from Precambrian to modern geological settings.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive mineral specimens or used in lapidary work.

Geological facts

Quartz is one of Earth’s most abundant minerals and has a six-sided trigonal crystal structure, although this fragment shows no complete crystal form.

Field identification & locations

Field clues include hardness sufficient to scratch ordinary glass, a white streak, glassy luster, and lack of cleavage; avoid confusing it with calcite, which is softer and effervesces in acid. Common worldwide, especially in quartz veins and granitic terrains.