gemstone

Polished/tumbled jasper, likely brecciated or orbicular jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration and pale quartz/chalcedony patches

AI-generated identification · may be incorrect

Opaque reddish-brown and cream stone with a waxy to dull luster and rounded tumbled form. Hardness about 6.5–7 Mohs; no visible cleavage; cryptocrystalline structure; specific gravity roughly 2.55–2.70.

Identified September 14, 2026More gemstone →

Explore Polished/tumbled jasper, likely brecciated or orbicular jasper in the encyclopedia →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic rock, with iron oxides producing the red color and later fracturing creating brecciation. Commonly Cenozoic or older; exact age cannot be determined visually.

Uses & applications

Used as a lapidary stone for cabochons, carvings, beads, and polished specimens; generally modest collector value.

Geological facts

The pale blue-green areas may be reflected light or pale chalcedony, but the image is insufficient to confirm turquoise or chrysocolla. A close look at broken edges and a hardness test would help.

Field identification & locations

Very plausible near 31.7°N, 116.6°W in northern Baja California, where volcanic rocks and silica-rich veins occur. Identify by its opaque pattern, red iron staining, lack of cleavage, and resistance to scratching; quartz should not scratch it easily, while jasper should scratch glass.