igneous
Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite
Quartz–feldspar aggregate; identification is uncertain from the photograph
AI-generated identification · may be incorrectCream to pale orange, rounded and strongly weathered, with granular texture and dull to vitreous luster; likely Mohs 6–7, with no obvious cleavage. Individual quartz and feldspar grains appear interlocked, and dark areas may be mica or iron/manganese staining.
Identified More igneous →
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Physical properties
Cream to pale orange, rounded and strongly weathered, with granular texture and dull to vitreous luster; likely Mohs 6–7, with no obvious cleavage. Individual quartz and feldspar grains appear interlocked, and dark areas may be mica or iron/manganese staining.
Formation & geological history
Likely a naturally eroded igneous or metamorphic cobble transported by water or sediment. Its age cannot be determined visually and depends on the source bedrock.
Uses & applications
Comparable material is used as aggregate, fill, and decorative stone; this particular specimen has modest collecting value unless it proves to be an unusual mineral or fossil.
Geological facts
The rounded shape indicates abrasion during transport, while orange coloration commonly results from iron-oxide weathering of feldspar or fractures.
Field identification & locations
Test a fresh surface: quartz-rich material scratches glass, while feldspar may show cleavage and is softer; dilute acid should not fizz unless carbonate is present. Common in streambeds, gravel deposits, and weathered granitic terrains.
