mineral

Weathered iron-rich quartz or limonite-bearing stone

Quartz (SiO₂) with iron-oxide/hydroxide coatings, likely goethite–limonite

AI-generated identification · may be incorrect

Small, yellow-brown, earthy and granular specimen with dull to slightly vitreous luster; quartz has Mohs hardness 7, while the iron-rich coating is softer (about 4–5), with no obvious cleavage. Exact identification is limited by the blurry image and lack of testing.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed by oxidation and weathering of iron-bearing minerals in a quartz-rich rock or hydrothermal vein; iron oxides commonly develop near Earth’s surface over geologically recent to ancient times.

Uses & applications

Common material has little commercial value, though quartz-rich pieces may be used as teaching specimens or lapidary material; attractive botryoidal goethite can be collectible.

Geological facts

Yellow-brown coloration is typical of hydrated iron oxides, especially limonite, rather than pure quartz. A white streak and hardness testing can help distinguish the components.

Field identification & locations

Common in soils, weathered veins, and oxidized ore zones worldwide, including iron-ore districts. Test streak, hardness, and magnetism; a glassy scratch-resistant interior suggests quartz, while a yellow-brown streak suggests limonite/goethite.