JASPER

CLASS: Oxide . . . CHEMICAL FORMULA: SiO2 . . . CRYSTAL SYSTEM: trigonal
CHALCEDONY type, which is a microcrystalline variety of QUARTZ. It usually presents spots, bands or stripes.
COLOR: all colors. It is usually made up of several colors.
PHYSICAL PROPERTIES: very hard (6,5/7 Mohs), light (2,58/2,91 g/cm3), lack of cleavage, opaque, with vitreous luster.
CURIOSITIES: Related to the contribution of encouragement for the achievement of our purposes.

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