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16.50.01: Ópalo Negro
https://espanol.libretexts.org/Geociencias/Geolog%C3%ADa/Libro%3A_Gemolog%C3%ADa/16%3A_Piedras_preciosas/16.50%3A_%C3%93palo/16.50.01%3A_%C3%93palo_Negro
Figura $\PageIndex{1}$ : Lightning Ridge Black Opal, 3.90 ct Foto de Jeff Scovil Cortesía de R.W. Wise Goldsmiths

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