gemstone

Polished carnelian (likely)

Carnelian, a reddish-orange chalcedony variety of microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Opaque to translucent reddish-orange and brown, with a glossy polished surface and no visible cleavage; quartz has Mohs hardness 7 and specific gravity about 2.6. The smooth finish suggests a tumbled or shaped specimen.

Identified October 10, 2026More gemstone →

Explore Polished carnelian (likely) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms as silica-rich chalcedony in cavities and fractures of volcanic rocks, with iron oxides producing its color. Chalcedony forms across many geological ages; the image cannot determine the specimen’s precise origin or age.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; also collected as a polished stone.

Geological facts

Carnelian has been used for seals and jewelry since antiquity; heating can deepen or alter its red-orange color.

Field identification & locations

Look for waxy luster, fine-grained texture, and orange-red color; common sources include India, Brazil, Uruguay, and Madagascar. The photo alone cannot confirm carnelian rather than another iron-stained chalcedony or jasper.