QUARTZ

CLASS: Oxide. . . CHEMICAL FORMULA: SiO2. . . CRYSTAL SYSTEM: trigonal
CRYSTAL FORM: hexagonal prism finished in two rhombohedra
COLOR: white, transparent (rock crystal), smoked, blue, citrine, violet (amethyst), yellow (tiger’s eye), pink, green (aventurine). . .
PHYSICAL PROPERTIES: very hard (7 Mohs), light (2,65 g/cm3), lack of cleavage, transparent / translucent, vitreous, pyroelectric and very piezoelectric shine (except Brazil law twins).
CURIOSITIES: related to the generation and channeling of positive energy and the contribution of serenity.