mineral

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to gray, opaque and nonmetallic with a glassy-to-dull luster; hardness 7 Mohs, no cleavage, irregular fracture, and trigonal crystal structure. The specimen appears rough and quartz-rich, though the photo does not show diagnostic crystal faces.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms as crystals in cooling silica-rich fluids, or as grains in igneous and metamorphic rocks; it occurs across many geological ages and settings.

Uses & applications

Quartz is used in glass and electronics; attractive pieces are collected or cut for ornaments and jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and resists weathering, so it is common in soils and many rock types.

Field identification & locations

Look for hardness sufficient to scratch ordinary glass and lack of cleavage; quartz occurs worldwide in veins, pegmatites, and many host rocks. The image alone cannot confirm whether this is pure quartz or a quartz-rich rock.