metamorphic

Red jasper (probable)

Microcrystalline quartz/chalcedony (SiO₂) colored by iron oxides

AI-generated identification · may be incorrect

Opaque brick-red to burgundy, earthy to dull luster, massive and fine-grained with irregular fracture; Mohs hardness about 6.5–7, no visible cleavage. The dark gray-green patches may be hematite, chlorite, or other matrix minerals.

Identified September 6, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic and sedimentary material, with iron oxidation producing the red color; its exact geological age cannot be determined from the photograph. It commonly occurs in iron-rich volcanic and hydrothermal environments.

Uses & applications

Used as decorative stone, cabochons, beads, carvings, tumbling material, and small ornamental objects; occasionally used for limited architectural facing.

Geological facts

Jasper is a variety of opaque chalcedony rather than a single mineral species. Red coloration generally reflects disseminated hematite or goethite.

Field identification & locations

Test for hardness against glass or a steel file, inspect the fine-grained texture, and check for a white streak rather than metallic behavior; acid usually produces no reaction. Common sources include India, Madagascar, Brazil, Australia, South Africa, and the western United States.