mineral

Tumbled jasper, likely mookaite or brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, orange-gold and brown mottling, waxy to dull luster, and no visible cleavage. Its rounded, polished form indicates tumbling; exact identification requires testing or a fresh surface.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or other rock, with iron oxides producing the warm colors. Mookaite jasper is especially associated with Cretaceous-age sediments of Western Australia, though similar jasper occurs worldwide.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and polished specimens; generally decorative rather than industrial.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz, unlike agate, which is typically translucent and banded. Color patterns commonly result from hematite or goethite.

Field identification & locations

Look for opacity, fine-grained texture, earthy red/orange coloration, and a glassy surface after polishing; it should scratch glass but not be scratched by a steel knife. Common sources include Australia, Brazil, India, Madagascar, and the western United States.