gemstone

Tumbled brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide-rich breccia fragments

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque, dark brown to reddish-brown with black and gray patches, and a waxy to vitreous luster; quartz is trigonal and has no cleavage, with conchoidal fracture. The rounded shape indicates tumbling and polishing.

Identified September 2, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic and sedimentary material, commonly preserving angular breccia textures; formation ages vary widely, from Precambrian to much younger volcanic settings.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and decorative objects; occasionally used as aggregate or ornamental stone.

Geological facts

Jasper’s colors commonly come from hematite, goethite, manganese oxides, or other impurities. “Brecciated jasper” describes its fragmented, cemented appearance rather than one single mineral species.

Field identification & locations

Identify it by its opaque patterned body, fine texture, high polish, and hardness sufficient to scratch glass; it should not show metallic sparkle or obvious translucent quartz crystals. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.