mineral
Tumbled jasper, likely mookaite or brecciated jasper
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
AI-generated identification · may be incorrectHardness 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.
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Physical properties
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.
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.
