mineral

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and possibly chlorite inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; mottled red-brown, cream, and dark green-gray; typically dull to vitreous/waxy luster, cryptocrystalline structure, and no visible cleavage. The irregular color patches suggest brecciation and later silica cementation.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement fractured volcanic or sedimentary material, with iron producing red-brown tones; most examples are Paleozoic to Cenozoic, though ages vary widely. Common sources include India, Madagascar, Brazil, Oregon, and Australia.

Uses & applications

Cut and polished for cabochons, beads, carvings, ornamental stone, and lapidary collections; rarely used as a durable architectural stone. Value is mainly aesthetic rather than gem rarity.

Geological facts

Jasper is a variety of chalcedony/quartz rather than a single mineral species. Brecciated patterns are created by angular fragments subsequently sealed by silica-rich material.

Field identification & locations

Identify it by its opaque, strongly patterned appearance, glassy-to-waxy polish, lack of cleavage, and inability to scratch it with a steel knife; quartz can scratch glass. Typical value is $5–$30 for a small rough or polished specimen, and $30–$100+ for exceptional lapidary pieces.