Carneol is a semi-precious stone and a color variety of chalcedon (microcrystalline varieties of quartz). The orange-red carnelian discoloration causes the creole (Fe2O3 / hematite) to form, and has also been named after that color. It occurs all over the world as a filler of magma and sedimentary rocks, where they are poured out of silicic acid solutions. The most famous site was from ancient times in the deserts of Arabia and Egypt.