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Opal from Querétaro, Mexico: fluid inclusion study

The distinctive orange-to-red “fire" opals from Querétaro have not been found in significant quantities at any other locality.

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New occurrence of fire opal from Bemia, Madagascar

Twenty-two gem opals from a new volcanic deposit located near Bemia

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Opal from Queretaro, Mexico: Occurrence and Inclusions

An examination of play-of-colour opal from Mexico and its variety of inclusions.

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