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Get PriceAug 15, 2016· Opal is mineraloid because of its noncrystalline nature and is an amorphous hydrated silica with a chemical composition of SiO2nH2O. The "n" in its formula indicates that the amount of water is variable. A mineraloid is a naturally occurring, inorganic solid that does not exhibit crystallinity. There are things To be considered a mineral.
Get PricePDF | "Leopard opal" consists of vesicular basalt impregnated with playofcolor opal, and is known only from Zimapán, Hidalgo State, Mexico. The formation of this ornamental stone was made ...
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