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but also for industrial purposes from watch gears and scientific instruments to sandpaper and other abrasives
Opals are hydrated amorphous forms of silica
Green Apatite is a transparent to translucent stone that may be green
red or orange body color
but its identity is complicated
Turquoise and Spiny Oyster 8mm Round - 15-16 Inch R0913 but also for industrial purposesTurquoise is an ancient gemstone, one of the first known to man. Known to Egyptian and Aztec cultures thousands of years ago, Turquoise is now mined all over the world. Turquoise is formed when water passes through aluminous rock where copper and other minerals are present. The deposits within the rock become Turquoise after a chemical reaction occurs over long periods of time. Natural Turquoise may be cut and polished, but will not be chemically
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