$Polished brecciated jasper pebble (Jasper, an opaque microcrystalline variety of quartz (SiO₂), with contrasting mineral-filled fractures) — metamorphic$

metamorphic

Polished brecciated jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with contrasting mineral-filled fractures

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; mottled yellow-brown with dark red-brown and black veining, opaque, waxy to dull luster, and no visible cleavage. The image suggests a polished pebble, but exact mineral inclusions cannot be determined visually.

Identified October 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Silica-rich fluids can cement or fill fractures in jasper, producing brecciated patterns; jasper occurs in varied geological settings and ages, often in volcanic rocks or sedimentary iron-rich deposits.

Uses & applications

Used for lapidary carvings, beads, cabochons, and decorative collectibles; not usually an industrial stone.

Geological facts

Jasper is a trade name for opaque, patterned chalcedony; colors and vein patterns vary widely with impurities and fracture-filling minerals.

Field identification & locations

Look for an opaque, fine-grained surface, polished sheen, and irregular contrasting patterns; common sources include India, Brazil, Madagascar, and the western United States. A scratch test or closer inspection is needed to confirm identification.