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Chalcedony has a unique crystalline structure that gives it an enormously variable appearance
Pure fluorite is clear
resulting from the oxidation of its copper and sulfide components
Chalcedony has a number of forms that are also considered gems of their own
depending on the presence of minerals like manganese or iron during the formation of the crystals
Meteorite - Sikhote-Alin - Octahedrite Petrified Coral Chalcedony has a unique crystallineCoarsest Octahedrite IIB Discovered 02 12 1947
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