gemstone

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and dark mineral inclusions

AI-generated identification · may be incorrect

Opaque, smoothly polished, with cream-yellow, orange, and black brecciated patches; dull to vitreous luster and no visible cleavage. Hardness is about 6.5–7 Mohs; specific gravity typically 2.5–2.7.

Identified August 20, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement and replace fragmented volcanic or sedimentary material, with iron oxides producing the yellow-orange colors. Jasper deposits formed in many geological periods, commonly in volcanic terrains.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and ornamental objects; not generally important for construction. Small polished pieces have modest lapidary value.

Geological facts

The black areas may be manganese oxides, magnetite, or another dark silicate rather than a single identifiable mineral from the photograph alone.

Field identification & locations

Identify by its opaque, hard, fine-grained texture, colorful irregular pattern, and resistance to scratching by steel; it should not fizz in dilute acid. Common sources include India, Madagascar, Brazil, Indonesia, and the western United States.