mineral

Red jasper (likely brecciated jasper/chalcedony)

Microcrystalline quartz, SiO₂, chiefly chalcedony with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque brick-red to orange-brown, gray and white; waxy to dull luster; hardness about 6.5–7 Mohs; conchoidal fracture, no cleavage, cryptocrystalline structure; specific gravity about 2.6.

Identified August 16, 2026More mineral →

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Physical properties

Opaque brick-red to orange-brown, gray and white; waxy to dull luster; hardness about 6.5–7 Mohs; conchoidal fracture, no cleavage, cryptocrystalline structure; specific gravity about 2.6.

Formation & geological history

Forms when silica-rich fluids fill fractures or replace volcanic and sedimentary rocks, with iron oxides producing the red coloration; age varies widely from Precambrian to much younger deposits.

Uses & applications

Used for carvings, cabochons, beads, tumblestones, ornaments, and decorative stone; occasionally used as a minor aggregate or facing material.

Geological facts

Jasper is a variety of opaque chalcedony distinguished from agate by its generally nontranslucent appearance; brecciation indicates broken fragments later cemented by silica.

Field identification & locations

Identify it by its red iron staining, opaque waxy surface, very hard edges, and conchoidal fracture; common sources include India, Madagascar, Brazil, Australia, and the western United States.