sedimentary

Likely jasper or iron-rich chert

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

AI-generated identification · may be incorrect

The foreground specimen is opaque reddish-orange with a dull to slightly waxy luster and appears naturally chipped or roughly polished. Hardness is about 6.5–7 Mohs; no visible cleavage, conchoidal fracture, and specific gravity around 2.6; exact identification is uncertain from the image alone.

Identified August 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper and chert form when silica-rich fluids replace or cement sediments, with hematite/goethite producing red-orange coloration. Formation commonly ranges from Precambrian to younger sedimentary ages in volcanic or marine environments.

Uses & applications

Used for cabochons, beads, carvings, lapidary pieces, and decorative stone; larger jasper masses may be used as ornamental aggregate. Common specimens generally have modest commercial value.

Geological facts

Iron-rich jasper can show brecciated, orbicular, or mottled patterns and may resemble red rhyolite or petrified material. A steel file should not easily scratch genuine quartz-rich jasper.

Field identification & locations

Common localities include Oregon, Idaho, Utah, Arizona, California, Australia, Brazil, India, and Madagascar. Field clues are high hardness, opaque red coloration, absence of fizz in dilute acid, and a glassy or waxy fracture; streak and texture tests help distinguish it from hematite or soft slag.