Mineral Factbook

Carnelian

Rock / aggregate

Carnelian is translucent orange-red chalcedony. It is a polycrystalline material rather than a single mineral species; its dominant component is Quartz.

Photos

Carnelian specimen photo
Steven Lek · CC BY-SA 4.0 · Commons
Carnelian specimen photo
Bobjgalindo · CC BY-SA 4.0 · Commons
Carnelian specimen photo
Teravolt (talk) · CC BY 3.0 · Commons
Carnelian specimen photo
User:Mattes · CC BY 2.0 de · Commons

About Quartz

Full reference data — crystallography, X-ray diffraction, and cited physical properties — is on the Quartz species page.

FormulaSiO2
Hardness (Mohs)7
Specific gravity2.6-2.64
Density (calculated)2.65
Crystal systemtrigonal
Color rangeblack, blue, brown, colorless, green, red, yellow
Lusterdull, greasy, vitreous
Streakwhite