mineral

Iron-stained quartz-rich rock fragments

Likely quartz (SiO₂) with limonite/goethite iron oxides; possibly quartzite or silicified rock

AI-generated identification · may be incorrect

Small irregular brown-gold fragments with vitreous to earthy luster and pale translucent areas. Quartz has Mohs hardness 7, no cleavage, and conchoidal fracture; iron oxides are softer, about 4–5.5. The image is too low-resolution for confident identification.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Likely silica-rich material colored by weathering and iron-oxide staining; quartz may have crystallized in veins or formed during metamorphism. Age cannot be determined from the photograph.

Uses & applications

Quartz-rich rock is used for glass, ceramics, abrasives, and construction aggregate; attractive pieces may be sold as mineral specimens. The fragments are not gem-grade based on visible appearance.

Geological facts

Golden-brown coloration commonly comes from limonite or goethite coatings rather than metallic gold. A steel nail should not scratch quartz, while iron-oxide coatings may powder or scratch more easily.

Field identification & locations

Look for glassy translucent grains, hardness near 7, and lack of cleavage; streak testing and a close examination of crystal faces would help distinguish quartzite, vein quartz, and slag. Common worldwide, especially in hydrothermal veins and weathered rocks.