mineral

Iron-rich jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz (SiO₂) colored by iron oxides/hydroxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown, ochre, and dark brown mottling with earthy to dull vitreous luster. Massive, cryptocrystalline structure, no visible cleavage, and typically a dense, fine-grained texture.

Identified September 15, 2026More mineral →

Explore Iron-rich jasper (likely brecciated or orbicular jasper) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sediments, volcanic material, or breccia, while iron minerals produce the red-brown coloration. Commonly Precambrian to Phanerozoic, depending on the deposit.

Uses & applications

Used as an ornamental and lapidary stone for cabochons, carvings, polished stones, and decorative slabs; rarely used as a minor silica source.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz; the mottled pattern can resemble breccia, orbicular jasper, or ironstone. Exact identification may require a fresh surface, streak test, and microscopy.

Field identification & locations

Look for a very hard, opaque surface that resists scratching by steel and commonly yields a white to brownish streak. Similar material occurs worldwide, including Australia, India, Madagascar, Brazil, and the western United States.