CLASS: Oxide. . . CHEMICAL FORMULA: SiO2. . . CRYSTAL SYSTEM: trigonal
CHALCEDONY type, which is a microcrystalline variety of QUARTZ
COLOR: orange red
PHYSICAL PROPERTIES: very hard (6,5/7 Mohs), light (2,60 g/cm3), lack of cleavage, translucent, with a vitreous luster.
CURIOSITIES: related to the development of creativity and vitality.