mineral

Iron-stained quartz with limonite/goethite

Quartz (SiO₂) with iron oxyhydroxides, commonly goethite (α-FeO(OH)) and limonite

AI-generated identification · may be incorrect

Rough, fractured specimen with ochre-yellow to rusty-brown coloration and earthy to vitreous patches. Quartz is Mohs 7, trigonal, and lacks cleavage; iron oxides are softer and commonly earthy or submetallic. Specific gravity varies with iron content.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Likely quartz-bearing vein or altered rock stained by iron-rich fluids and weathering. The minerals may form in many geological settings and ages; the image alone cannot establish a specific age or locality.

Uses & applications

Mostly a mineral-collecting specimen; quartz is widely used in glass, electronics, and abrasives, while iron oxides are important iron ores and pigments.

Geological facts

Yellow-brown coatings commonly result when iron-bearing minerals oxidize and hydrate during weathering.

Field identification & locations

Look for hard, glassy quartz that resists scratching by a steel knife, contrasting with softer earthy rusty coatings. The image does not support a precise locality or definitive mineral identification.