sedimentary

Jasper (likely brecciated or iron-stained jasper)

Microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque reddish-brown, tan, cream, and yellow coloration with earthy to waxy luster. Quartz forms a cryptocrystalline mass with no visible cleavage and commonly conchoidal fracture; the rounded surface appears naturally weathered or tumbled.

Identified August 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine-grained sediments, volcanic ash, or breccia, with hematite/goethite producing the red and yellow colors. Its age depends on the deposit; jasper occurs from Precambrian through relatively young volcanic and sedimentary settings.

Uses & applications

Used for beads, cabochons, carvings, ornamental stone, and decorative objects; massive material has limited construction value. Common specimens typically sell for about $5–$30, while attractive polished pieces may reach $50–$150.

Geological facts

The irregular internal color boundaries and iron-rich staining are characteristic of brecciated or scenic jasper. It may resemble chert, but jasper is typically more vividly colored and opaque.

Field identification & locations

Look for a dense, opaque stone that scratches glass and leaves no obvious metallic streak; a steel file should make little impression. Common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States.