mineral

Possible carnelian (brown-orange chalcedony)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony

AI-generated identification · may be incorrect

Opaque to slightly translucent brown-orange, with a waxy to dull luster and no obvious cleavage; quartz hardness is 6.5–7 Mohs, specific gravity about 2.6. The image alone cannot confirm the identification; the specimen appears naturally rounded or worn.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Chalcedony forms as silica precipitates in cavities and fractures, with iron oxides producing orange-brown colors. It may occur in rocks of many ages; its precise age and formation setting cannot be determined from the image.

Uses & applications

Used for beads, carvings, cabochons, and decorative objects; rough pieces are also collected.

Geological facts

Carnelian is an orange-red variety of chalcedony, but brown coloration and surface staining can make visual identification uncertain.

Field identification & locations

Check for a waxy luster, conchoidal fracture, and hardness sufficient to scratch glass; compare with agate or jasper, which are also chalcedony. Chalcedony occurs worldwide in volcanic and sedimentary settings.