mineral
Red-orange jasper pebble (tentative)
Microcrystalline quartz, SiO₂, colored mainly by iron oxides
AI-generated identification · may be incorrectOpaque orange-red, dull to waxy luster, fine-grained and likely Mohs hardness 6.5–7; no visible cleavage, conchoidal fracture may occur. The rounded, porous-looking surface could also indicate iron-rich chert or a fired/man-made material, so identification from the image is uncertain.
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Physical properties
Opaque orange-red, dull to waxy luster, fine-grained and likely Mohs hardness 6.5–7; no visible cleavage, conchoidal fracture may occur. The rounded, porous-looking surface could also indicate iron-rich chert or a fired/man-made material, so identification from the image is uncertain.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement sediments, with iron oxides producing the color; deposits range from Precambrian to recent. It commonly occurs as weathered pebbles in volcanic, hydrothermal, and sedimentary environments.
Uses & applications
Used for cabochons, beads, carvings, tumbling, ornaments, and occasionally decorative stone; this small pebble has minimal commercial value.
Geological facts
A glass-scratch test can help distinguish jasper from soft clay or brick, but it may damage the specimen. Acid generally produces no reaction, unlike carbonate rocks.
Field identification & locations
Commonly found in river gravels and iron-rich volcanic or sedimentary terrains, including Australia, India, Brazil, Madagascar, and the western United States. Confirm by hardness, dense fracture, and a white streak; a streak that is red-orange and a very porous texture may instead suggest hematite-rich material.
