sedimentary

Polished brecciated jasper

Jasper, a microcrystalline quartz variety (SiO₂); brecciated iron-oxide-bearing jasper

AI-generated identification · may be incorrect

Likely Mohs 6.5–7; opaque, polished surface with angular cream, yellow, and brown fragments in a dark matrix. Mostly microcrystalline quartz, with iron oxides providing color; crystal structure is too fine to see unaided.

Identified October 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Silica-rich material was fractured, then cemented and stained by iron-bearing minerals; later alteration and silicification produced the jasper. The exact locality and geological age cannot be determined from the image.

Uses & applications

Used for cabochons, beads, ornamental objects, and lapidary collections; not generally used as structural stone.

Geological facts

Jasper’s varied patterns arise from impurities and brecciation, making each polished piece distinctive.

Field identification & locations

The opaque, multicolored pattern and glassy-to-waxy polish are typical of jasper; hardness and a white streak can help distinguish it from softer lookalikes. Jasper occurs worldwide, including India, Brazil, Madagascar, and the western United States.