Opalo, anhídrido silícico hidratado

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El ópalo es un cuarzo compuesto por un anhídrido silícico hidratado, con una proporción de entre un 3 y un 9% de agua que, por tratarse de una sustancia coloidal, carece de estructura cristalina, es decir, es un mineral amorfo. Por lo general, aparece en depósitos a baja temperatura en torno a fuentes termales, bajo …

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