Jasper is a microcrystalline variety of Quartz, a silicon dioxide mineral with a hardness of 6.5 to 7. Its cyrstal system is hexagonal (trigonal). In Jasper, the Quartz microcrystals are laid out in sugar-like grains. The name Jasper is derived from a Greek word meaning 'spotted stone.' Jaspers can include up to 20" foreign materials, which account for its wide variety of colors and patterns. It occurs in nodules or as fillings in fissures. Jaspers are found all over the world.
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