mineral

Polished red-brown jasper or jasper-rich agate

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque reddish-brown, cream, and dark maroon banding; waxy to glossy luster after polishing; cryptocrystalline quartz with no visible cleavage and conchoidal fracture. Specific gravity is typically 2.55–2.70.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, with iron oxides producing the red-brown coloration. Deposits are generally geologically young to ancient, commonly associated with volcanic terrains.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and ornamental objects; occasionally used as an architectural or decorative stone.

Geological facts

The specimen’s irregular opaque body and curved cream band strongly favor jasper or brecciated jasper rather than transparent agate. Surface gloss appears to come from polishing or a possible coating.

Field identification & locations

Identify by its opaque red coloration, iron staining, curved silica bands, and glassy/waxy polish; common sources include India, Madagascar, Brazil, Mexico, Australia, and the western United States. A definitive identification may require magnification or testing.