Opal is a hydrated amorphous form of silica.

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Keywords: brillo, coleccionismo, color, cristal, cristales, cuadrado, cuarzo, dureza, eduardo, estellez, fondo, gemologia, geologia, horizontal, igneas, industrial, macro, metamorficas, mineral, mineria, nadie, natural, naturaleza, negro, opalo, piedra, plano, primer, reflejo, roca, sedimentarias, silice, solido, traslucido