mineral

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to pale gray, opaque and massive, with a vitreous-to-dull luster and no visible cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The image alone cannot confirm the identification; the fragment may also be another light-colored quartz-rich rock.

Identified October 6, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in fractures and veins, or as quartz grains in other rocks. It occurs in rocks of many ages and geological settings.

Uses & applications

Commonly used for ornamental objects, jewelry, countertops, and silica products; this small, uncut piece is mainly a modest collecting specimen.

Geological facts

Quartz is one of Earth’s most abundant minerals and scratches glass; its conchoidal fracture produces curved, shell-like surfaces.

Field identification & locations

Look for a glassy appearance, hardness near 7, and lack of cleavage; quartz is widespread in veins, pegmatites, and many rock types worldwide. A confident identification would require closer inspection or simple hardness tests.