red form of chalcedony, with a milky red color banded with browns and white.
It's a very energetic stone that is used in magick for love, passion, energy, and power. Carrying carnelian will warm your soul and put fire in your step. It can give you confidence during public speaking.
In folklore, people associated the mottled red of carnelian with blood. So the stone was used to help cure blood-related problems, including nose bleeds.
Carnelian is particularly sacred to Muslims, because the prophet Mohammad wore a signet ring of carnelian.