mineral
Polished red jasper (likely brecciated jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
AI-generated identification · may be incorrectOpaque red to salmon with cream mottling and a glassy-to-waxy polish; likely Mohs 6.5–7, no visible cleavage, cryptocrystalline structure, specific gravity about 2.5–2.7. The oval form is tumbled or cabochon-polished.
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Physical properties
Opaque red to salmon with cream mottling and a glassy-to-waxy polish; likely Mohs 6.5–7, no visible cleavage, cryptocrystalline structure, specific gravity about 2.5–2.7. The oval form is tumbled or cabochon-polished.
Formation & geological history
Forms when silica-rich fluids replace or cement volcanic and sedimentary material, with iron oxides producing the red color; commonly Precambrian to younger, depending on deposit. This appearance is consistent with lapidary material rather than a naturally rounded pebble.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and decorative objects; durable but not typically high-value jewelry material.
Geological facts
Cream patches may indicate brecciation, quartz-rich veins, or altered host rock. Red color generally reflects hematite or related iron minerals.
Field identification & locations
Identify by its opacity, strong red iron staining, fine texture, and lack of individual crystals; it should resist scratching by a steel knife, though testing can damage the polish. Jasper and related rocks occur widely, including glacially transported material in Estonia and the Baltic region.
