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The most famous source of fire opals is the state of Querétaro in Mexico; these opals are commonly called Mexican fire opals. [47] Fire opals that do not show a play of color are sometimes referred to as jelly opals. Mexican opals are sometimes cut in their rhyolitic host material if it is hard enough to allow cutting and polishing.
Artillery of Mexico (2 P) F. Firearms of Mexico (4 C, 1 P) This page was last edited on 30 November 2012, at 06:51 (UTC). Text is available under the ...
Precious Gemstone: Virgin Valley black fire opal (1987) Semiprecious Gemstone: Nevada turquoise ... New Mexico [51] Turquoise (1967) New York [52] Garnet (1969) North ...
Meet the "Virgin Rainbow" – perhaps the finest and certainly the most expensive opal on record. It literally glows in the dark. In fact, as it gets darker around the opal, the opal appears ...
Each of the three notable types of opal – precious, common, and fire [3] – display different optical effects; therefore, the intended meaning varies depending on context. The general definition of opalescence is a milky iridescence displayed by an opal, which describes the visual effect of precious opal very well, and opalescence is ...
Fire agate, a variety of chalcedony, is a semi-precious natural gemstone discovered so far only in certain areas of central and northern Mexico and the southwestern United States (New Mexico, Arizona and California). [1] Approximately 24-36 million years ago these areas were subjected to massive volcanic activity during the Tertiary Period.