mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, glassy-to-dull luster, irregular fracture, and no visible cleavage; hardness 7 Mohs, specific gravity about 2.65, with a trigonal crystal structure. The image is consistent with rough quartz, though identification from a photo is not definitive.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins and cavities, or during igneous and metamorphic processes. Quartz is found in rocks of many ages, from ancient crust to recent veins.

Uses & applications

Used in glassmaking, electronics, abrasives, and construction aggregate; attractive or well-formed specimens are collected and occasionally used in jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly occurs as veins cutting through other rocks.

Field identification & locations

Look for its glassy appearance, lack of cleavage, and ability to scratch ordinary glass; common worldwide in veins, pegmatites, and many rock types. Similar pale minerals can require hardness or other tests to distinguish.