mineral

Iron-stained quartz

Quartz (SiO₂), colored by iron-oxide staining

AI-generated identification · may be incorrect

Translucent white to honey-brown with a vitreous luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The image suggests a small rough fragment, but exact identification is uncertain from appearance alone.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms in silica-rich veins and cavities as magma cools or from hydrothermal fluids; iron oxides can stain it later. Its age depends on the host formation and cannot be determined from the photo.

Uses & applications

Quartz is used in glassmaking, abrasives, electronics, and ornamental objects; attractive pieces may be collected or used in jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and often occurs with iron-oxide minerals that produce yellow, orange, or brown coloration.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch glass, and absence of cleavage; the rusty color may be a surface coating. Common worldwide in veins, pegmatites, and sedimentary deposits.