mineral

Polished brecciated jasper (likely ribbon jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque, with a waxy to vitreous luster and red-brown, gray, or cream angular bands. Its patterns reflect quartz-rich silica cementing fragmented material; no visible cleavage.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement and replace sedimentary or volcanic fragments, with iron oxides producing the red coloration. Jasper deposits are geologically varied, commonly Precambrian to younger; the pictured piece is polished/tumbled.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary collections; occasionally as decorative stone. Common polished pieces generally have modest commercial value.

Geological facts

The banding and contrasting patches are natural mineral textures, not necessarily agate; jasper is opaque, whereas agate is usually translucent. Iron oxide minerals such as hematite or goethite commonly create its red and brown colors.

Field identification & locations

Identify it by its opaque body, hardness, fine-grained texture, and red-brown patterned bands; it should resist scratching by steel. Common sources include India, Madagascar, Brazil, Australia, and the United States.