igneous
Iron-stained quartz-bearing rock, possibly weathered granite or pegmatite
Quartz-rich felsic rock with iron oxyhydroxides (goethite/limonite); exact classification requires testing
AI-generated identification · may be incorrectLikely quartz with feldspar and minor dark mica or amphibole, coated by orange-brown limonite/goethite. Hardness approximately 6–7 for quartz, vitreous to earthy luster, granular texture, poor cleavage overall, and variable density around 2.6–2.8.
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Physical properties
Likely quartz with feldspar and minor dark mica or amphibole, coated by orange-brown limonite/goethite. Hardness approximately 6–7 for quartz, vitreous to earthy luster, granular texture, poor cleavage overall, and variable density around 2.6–2.8.
Formation & geological history
Probably formed from silica-rich magma as granite or pegmatite, then chemically weathered near the surface; the rusty colors represent oxidation of iron-bearing minerals. Its precise age and rock type cannot be determined from the photograph.
Uses & applications
Common material has little commercial value, though quartz-rich fragments may be used as decorative stone or educational specimens; attractive iron-stained pieces are collected.
Geological facts
Orange, yellow, and brown coloration is typical of hydrated iron oxides rather than orange quartz. The dark gray patches may be biotite, amphibole, or weathered sulfide minerals.
Field identification & locations
Look for glassy quartz, blocky feldspar, visible mica, and rusty coatings; a steel file should scratch feldspar but generally not quartz. Common in weathered granitic terrains worldwide.
