metamorphic

Polished orbicular jasper

Jasper (microcrystalline quartz, SiO₂), commonly orbicular/poppy jasper

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brick-red to orange-brown with yellow cream orbicules, vitreous to waxy luster, cryptocrystalline quartz, and no visible cleavage. Specific gravity is roughly 2.55–2.70.

Identified September 7, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids cement or replace volcanic ash and other sediments; orbicules develop through concentric mineral growth or alteration. Most specimens are Paleozoic to Mesozoic, depending on locality.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and ornamental objects; too decorative and variable for major construction use. Attractive pieces have modest collector value.

Geological facts

The yellow spots are altered volcanic or mineral-rich inclusions, not holes. “Poppy jasper” is a trade name often applied to red orbicular jasper, especially from California and Madagascar.

Field identification & locations

Identify it by its opaque red matrix, rounded yellow/cream patterns, very fine grain, and ability to scratch ordinary glass. Common sources include California, Madagascar, Mexico, India, and Indonesia; acid testing is unnecessary.