sedimentary

Red jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque red to maroon with brown-gray patches, dull to waxy luster, and no visible cleavage; conchoidal fracture may occur. The specimen appears rough and iron-stained, though exact identification cannot be confirmed from a photograph.

Identified September 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when silica-rich sediment or volcanic material is replaced or cemented by microcrystalline quartz, with iron oxides producing the red color. It may range from Precambrian to much younger, depending on the deposit.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, countertops, and lapidary material; attractive pieces are collected.

Geological facts

Jasper is a variety of opaque chalcedony/chert rather than a single mineral species. Red coloration generally reflects hematite inclusions.

Field identification & locations

Identify by its dense, opaque appearance, red iron-oxide coloration, lack of cleavage, and glassy/conchoidal fracture when broken; common in sedimentary and volcanic terrains worldwide, including India, Brazil, Madagascar, Australia, and the western United States.