Mineral - Carnelian

Name Carnelian
Class Semi-precious
Category Microcrystalline quartz (Chalcedony)
Crystal system Rhombohedral
Chemical composition Silicon dioxide (SiO₂), presence of iron oxides giving the reddish-orange color
Hardness (Mohs scale) 6.5 to 7
Transparency Translucent
Geographical origin India, Brazil, Uruguay, Madagascar, United States