gemstone

Tumbled jasper (likely brecciated or red jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque reddish-brown to tan, vitreous-to-waxy luster, and rounded tumbled surfaces. Mohs hardness is about 6.5–7; no visible cleavage and typically massive, cryptocrystalline structure.

Identified September 5, 2026More gemstone →

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Physical properties

Opaque reddish-brown to tan, vitreous-to-waxy luster, and rounded tumbled surfaces. Mohs hardness is about 6.5–7; no visible cleavage and typically massive, cryptocrystalline structure.

Formation & geological history

Jasper forms when silica-rich fluids replace or cement sediments and volcanic material, with iron oxides producing red and brown colors. Its exact geological age cannot be determined from the photograph; specimens occur in many ancient and younger volcanic-sedimentary terrains.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and inexpensive polished specimens; historically used for tools and decorative stone.

Geological facts

The upper piece may be brecciated jasper or a jasper variety mixed with lighter chalcedony, while the lower piece appears predominantly red jasper. Tumble polishing can obscure natural textures and diagnostic features.

Field identification & locations

Identify jasper by its opacity, earthy red coloration, fine texture, and lack of visible crystal grains; it should not scratch easily with a steel knife. Common sources include India, Madagascar, Brazil, the United States, and Australia.