mineral

Tumbled jasper, likely red/brown jasper

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

AI-generated identification · may be incorrect

Opaque reddish-brown with a fine-grained texture and earthy to waxy luster; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and conchoidal fracture. The smooth shape indicates tumbling or natural abrasion.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal material, with iron producing the brown-red color. Deposits occur in many ages and settings worldwide; the specimen’s exact origin cannot be determined from the image.

Uses & applications

Used as an ornamental stone for cabochons, beads, carvings, polished stones, and small decorative objects; occasionally used as a minor lapidary material.

Geological facts

Jasper is an opaque variety of chalcedony, unlike translucent agate. Its patterns and colors commonly result from hematite, goethite, clay, or other mineral inclusions.

Field identification & locations

Identify it by its opaque earthy color, fine texture, high polish, and inability to scratch easily with a steel knife; glass should be scratched by quartz. Common sources include Oregon, Idaho, Arizona, India, Madagascar, Brazil, and Australia.