igneous
Iron-stained quartz-rich rock (likely weathered granite or quartzite)
Quartz–feldspar rock with iron-oxide staining; exact rock type cannot be confirmed from the image
AI-generated identification · may be incorrectRough, opaque, mottled rust-red, yellow, and cream; likely quartz and feldspar with hematite/goethite staining. Quartz is Mohs 7, feldspar about 6; luster is mostly dull, with no obvious cleavage visible.
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Physical properties
Rough, opaque, mottled rust-red, yellow, and cream; likely quartz and feldspar with hematite/goethite staining. Quartz is Mohs 7, feldspar about 6; luster is mostly dull, with no obvious cleavage visible.
Formation & geological history
Likely formed from crystallized or metamorphosed silica-rich rock, then weathered and stained by iron oxides. The image does not provide enough detail to determine its age or precise formation environment.
Uses & applications
As an ordinary loose fragment, it has little commercial use; similar rocks may be used as aggregate or landscaping stone.
Geological facts
Iron oxides commonly color otherwise pale rocks red, orange, or yellow. The specimen’s identity is tentative because texture and mineral grains are not clearly resolved.
Field identification & locations
Look for interlocking quartz and feldspar grains, hardness greater than glass, and rusty staining; confirm with a fresh break or hand lens. Common in many regions, but the pictured fragment’s source is unknown.
