mineral

Carnelian Agate

Silicon Dioxide (SiO2) with high Iron Oxide impurities

Hardness: 6.5–7 (Mohs scale); Color: Orange, reddish-brown, or deep red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.64

Hardness: 6
Color: Orange, reddish-brown, or deep red
Luster: Vitreous to waxy

Identified April 13, 2026More mineral →

Explore Carnelian Agate 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

Formed from the deposition of silica from groundwater in cavities of igneous rocks. The color is derived from iron oxide impurities that have been heated over geological time.

Uses & applications

Predominantly used in jewelry, beadwork, and cabochons. Historically used for cylinder seals and signet rings because hot wax does not stick to it.

Geological facts

Ancient Romans and Greeks used carnelian for intaglio rings. It was believed to provide courage in battle and is often associated with the 'Solar Plexus' chakra in metaphysical traditions.

Field identification & locations

Identify by its translucent orange/red color and characteristic curved (conchoidal) fracture. In the field, look for pebbles with a waxy exterior in riverbeds or volcanic regions like Brazil, India, or Madagascar.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Granite

Granite (Phaneritic intrusive igneous rock)

igneous