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Fire opal is a transparent to translucent opal with warm body colors of yellow to orange to red. Although fire opals don't usually show any play of color, they occasionally exhibit bright green flashes. The most famous source of fire opals is the state of Querétaro in Mexico; these opals are commonly called Mexican fire opals. [47]
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.
Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, [1] a hydrated silicon dioxide. [2] This effect appears as a milky, translucent glow that changes with the angle of light, often creating a soft, pearly sheen that can display various colors or hues.
Opal is the traditional birthstone for October. It is believed the stone was discovered in India and given the name " upala ," or "precious stone" in Sanskrit, the Geological Institute of America ...
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Opal is a primarily feminine given name derived from the name of the gemstone opal. The gemstone is the birthstone for October. Its name is derived from the Sanskrit upala , which means 'jewel'. [1] It came into use along with other gemstone names during the late Victorian era.