metamorphic
Banded jasper (likely red jasper with dark matrix)
Microcrystalline quartz, SiO₂, colored mainly by iron oxides; dark bands may contain manganese oxides or fine silicate minerals
AI-generated identification · may be incorrectOpaque reddish-brown and charcoal-gray bands, earthy to waxy luster, and fine-grained texture; Mohs hardness about 6.5–7, no visible cleavage, conchoidal fracture, and typical specific gravity near 2.6.
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Physical properties
Opaque reddish-brown and charcoal-gray bands, earthy to waxy luster, and fine-grained texture; Mohs hardness about 6.5–7, no visible cleavage, conchoidal fracture, and typical specific gravity near 2.6.
Formation & geological history
Jasper forms when silica-rich fluids or sediments are cemented and altered, with iron and other impurities producing the colors; exact age and locality cannot be determined from the image.
Uses & applications
Used for cabochons, beads, carvings, bookends, and ornamental stone; this small rough piece has modest collector value.
Geological facts
The specimen appears naturally banded and weathered, possibly a jasper-rich pebble rather than a single uniform mineral crystal.
Field identification & locations
Identify it by its opaque red coloration, dark bands, very fine grain, and resistance to scratching; common sources include India, Madagascar, Australia, Brazil, and the western United States. A steel file should generally scratch it only with difficulty.
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