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Opal from Querétaro, Mexico: fluid inclusion study

Ronald J. Spencer, Alfred A. Levinson

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

New occurrence of fire opal from Bemia, Madagascar

Martina Simoni, Franca Caucia, Ilaria Adamo, and Pietro Galinetto

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

Opal from Queretaro, Mexico: Occurrence and Inclusions

John I. Koivula, Chuck Fryer, June 1, 1983

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