sedimentary

Polished brecciated jasper

Jasper, an opaque microcrystalline quartz variety; primarily SiO₂ with iron-oxide and clay inclusions

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque, brown, gray, cream, and rusty red, with a vitreous-to-waxy luster after polishing. Cryptocrystalline quartz has no visible cleavage; specific gravity is about 2.5–2.7.

Identified September 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement and replace fine sediment or volcanic fragments, commonly producing brecciation and iron staining. Most jasper is Precambrian to Phanerozoic, with age dependent on its source deposit.

Uses & applications

Used for cabochons, beads, carvings, ornamental slabs, and decorative objects; its toughness makes it popular in lapidary work. Common polished pieces generally have modest value.

Geological facts

The angular contrasting fragments and silica-rich cement indicate brecciation, while rusty colors reflect hematite or goethite. Exact variety names such as picture, scenic, or brecciated jasper are often commercial rather than strict scientific classifications.

Field identification & locations

Common in volcanic and sedimentary terrains worldwide, including India, Madagascar, Brazil, Australia, and the western United States. Identify it by its opacity, fine texture, hardness, lack of cleavage, and inability to scratch with a steel knife; this polished specimen is likely jasper rather than agate.