metamorphic

Brecciated jasper with quartz vein

Jasper (microcrystalline quartz, SiO₂) with quartz/chalcedony cement; brecciated silica-rich rock

AI-generated identification · may be incorrect

Mostly opaque reddish-brown jasper with cream-to-white quartz or chalcedony patches and a vitreous-to-waxy luster; Mohs hardness about 6.5–7, no visible crystal structure, and conchoidal fracture. Exact mineral composition cannot be confirmed from appearance alone.

Identified October 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Silica-rich fluids filled and cemented fractures in pre-existing rock, producing angular-looking color zones; later iron staining likely gave the brown-red color. Such material forms in many ages and geological settings; a precise age or locality cannot be determined from the image.

Uses & applications

Used as a lapidary rough for cabochons, beads, carvings, and decorative pieces; not generally an industrial or construction stone.

Geological facts

Jasper is an opaque variety of chalcedony, itself microcrystalline quartz. Pale areas may be quartz or chalcedony, but visual identification alone cannot establish their exact mineralogy.

Field identification & locations

Look for hardness near 7, opaque earthy colors, and a waxy/glassy surface; quartz-rich areas may scratch glass. Common in silica-rich veins and volcanic or sedimentary settings worldwide; the image does not establish a specific source.