sedimentary

Polished brecciated jasper

Iron-oxide-rich microcrystalline quartz (SiO₂), with hematite/goethite; likely brecciated jasper

AI-generated identification · may be incorrect

Opaque, orange-red and charcoal-gray angular patches; vitreous to dull luster; quartz crystals are too fine to see. Mohs hardness about 6.5–7, no cleavage; specific gravity roughly 2.6–2.8.

Identified October 13, 2026More sedimentary →

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Physical properties

Opaque, orange-red and charcoal-gray angular patches; vitreous to dull luster; quartz crystals are too fine to see. Mohs hardness about 6.5–7, no cleavage; specific gravity roughly 2.6–2.8.

Formation & geological history

Silica-rich fluids cemented or replaced rock fragments, while iron oxides produced the vivid colors; later fracturing and recementation formed the breccia texture. Exact age and locality cannot be determined from the image.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, and polished display pieces; jasper is generally not an industrial construction stone.

Geological facts

Jasper is an opaque variety of chalcedony, and its patterns arise from impurities and fragmental textures rather than visible large crystals.

Field identification & locations

The image shows a polished specimen with irregular gray fragments in an orange iron-rich matrix, consistent with brecciated jasper; confirm by scratch testing against glass and checking that it is opaque. Jasper occurs worldwide, including India, Australia, Brazil, and the western United States.