
mineral
Polished ocean jasper / orbicular jasper (likely)
Microcrystalline quartz (chalcedony), commonly with iron-oxide and other mineral inclusions
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; dark blue-green to gray matrix with orange-red iron-oxide patches, opaque, waxy to dull luster, and no visible cleavage. The rounded shape and smooth surface indicate a polished or naturally water-worn specimen.
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Physical properties
Hardness about 6.5–7 Mohs; dark blue-green to gray matrix with orange-red iron-oxide patches, opaque, waxy to dull luster, and no visible cleavage. The rounded shape and smooth surface indicate a polished or naturally water-worn specimen.
Formation & geological history
Forms when silica-rich fluids fill cavities or replace volcanic rock, with iron oxides producing the red-orange areas; many ocean jasper varieties formed in Paleogene volcanic settings, especially Madagascar. Exact identification requires testing because similar material includes jasper, rhyolite, and slag.
Uses & applications
Used for cabochons, carvings, beads, polished stones, and mineral collections; not generally used structurally.
Geological facts
Jasper is an opaque variety of chalcedony, and its colors commonly result from hematite, goethite, chlorite, or other inclusions.
Field identification & locations
Check for a consistently fine-grained texture, glassy/waxy fracture, and hardness sufficient to scratch ordinary glass; natural jasper lacks bubbles and flow textures typical of slag. Common sources include Madagascar, Oregon, Mexico, and Australia.
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