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Description:
Opal is a silica gel containing 5%-30% water. Fire is caused by tiny silica spheres defracting light. The larger the spheres, the more intense the fire and variety of color. Australia has been the major producer of quality Opal since the 19th century.
Hardness:
6
Origin:
Australia, Mexico, Brazil
Varieties:
Black Opal (potch), Boulder Opal (iron stone), white based opal.