gemstone

Tumbled carnelian or red jasper

Microcrystalline quartz (chalcedony), SiO₂, likely iron-stained

AI-generated identification · may be incorrect

Small rounded, polished specimen with reddish-brown color, translucent-to-opaque appearance, and vitreous-to-waxy luster. Mohs hardness 6.5–7; no cleavage; cryptocrystalline structure; typical specific gravity about 2.6.

Identified August 25, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or fractures, with iron oxides producing the red-brown color; commonly associated with volcanic rocks and sedimentary deposits. Geological age varies widely, from relatively young nodules to Paleozoic or older host formations.

Uses & applications

Used for inexpensive cabochons, beads, carvings, worry stones, and ornamental objects; generally modest collector value.

Geological facts

Carnelian is the more translucent, orange-red variety of chalcedony, while opaque brown-red material is often sold as red jasper; visual inspection alone cannot distinguish them reliably.

Field identification & locations

Common in India, Brazil, Uruguay, Madagascar, Germany, and the western United States. Identify by its smooth conchoidal fracture, lack of cleavage, hardness, and resistance to scratching by steel; a tumbled finish obscures natural textures.