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is a calcium aluminium hydroxy sorosilicate belonging to the epidote group of minerals
bright red
so it fractures easily
the result was glass permeated with thousands of tiny metallic sparkles
Australian Boulder Opal 6mm Round - 15-16 Inch Hackamite is a calcium aluminium hydroxyBoulder Opal is a golden brown to dark brown stone, displaying these colors in patterns of parallel bands. It is considered a precious Opal, and forms within a host rock such as ironstone or sandstone. Boulder Opal is believed to help with spiritual development, as well as with reconciling conscious and unconscious thought.
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