sedimentary

Tumbled jasper, likely brecciated or mookaite jasper

Microcrystalline quartz (SiO₂) with iron-oxide inclusions; possibly brecciated jasper

AI-generated identification · may be incorrect

Opaque reddish-brown and cream stone with a polished, waxy-to-vitreous luster and irregular color patches. Quartz hardness is about 6.5–7 Mohs; no visible cleavage, conchoidal fracture, and typical specific gravity near 2.6.

Identified September 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater replaces or cements sediment and volcanic material, with iron oxides producing red-brown colors; brecciated varieties preserve angular fragments. Formation ages vary widely, commonly Paleozoic to Mesozoic or younger depending on locality.

Uses & applications

Used for cabochons, beads, ornaments, carvings, and inexpensive tumbled-stone collections; occasionally used as decorative facing stone.

Geological facts

The image shows a polished/tumbled specimen, so natural surface texture and diagnostic crystal grains are largely concealed. Exact variety and locality cannot be confirmed from appearance alone.

Field identification & locations

Identify by its opacity, fine texture, red-brown iron staining, and resistance to scratching; it should not be scratched by a steel knife easily. Common sources include Australia, Brazil, Madagascar, India, and the western United States.