mineral

Iron-stained quartz with limonite/goethite

Quartz (SiO₂) with iron oxides/hydroxides, chiefly goethite (α-FeO(OH)) and limonite

AI-generated identification · may be incorrect

The specimen appears to contain translucent brown-yellow quartz with rusty red-brown coatings or inclusions. Quartz has Mohs hardness 7, vitreous luster, hexagonal crystal structure, no cleavage, and specific gravity about 2.65; iron staining varies in hardness and luster.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms as silica-rich fluid fills veins and fractures; iron minerals can later stain or coat it during weathering. The image alone does not establish its geological age or precise formation environment.

Uses & applications

Quartz is used in glass, electronics, and as a gemstone or collectible; iron-rich material is mainly collected for its color and texture.

Geological facts

Iron oxides can produce yellow, ochre, red, and brown colors in otherwise clear or milky quartz.

Field identification & locations

Look for glassy translucence and conchoidal fracture in quartz, with rusty coatings that may rub off; a steel point generally will not scratch quartz. Quartz and iron oxides occur widely in veins and weathered deposits worldwide.