mineral

Milky quartz with iron staining

Quartz (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with a vitreous luster and massive, non-cleaved structure. The gray-brown areas may be iron-oxide staining or attached host material.

Identified October 15, 2026More mineral →

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Physical properties

Hardness 7 Mohs; white to translucent with a vitreous luster and massive, non-cleaved structure. The gray-brown areas may be iron-oxide staining or attached host material.

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in fractures and pegmatites; the image does not establish the specimen’s age or exact formation setting.

Uses & applications

Quartz is used in glass, electronics, abrasives, and decorative stone; this rough piece is mainly suitable for collecting or display.

Geological facts

Quartz has a trigonal crystal structure, though massive specimens like this may show no distinct crystal faces.

Field identification & locations

Milky color and glassy appearance suggest quartz; confirm with a glass-scratch test, since quartz scratches glass. It occurs worldwide in veins, pegmatites, and many rock types.