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Fire Opal

A Variety of Opal
Fire opal is a variety of opal. It is bright orange in colour, and always reminds us of barley sugar sweets. It can vary from completely translucent without any opalescence or iridescence, to semi-translucent with very noticeable flashes of iridescent colour.
It is often called Mexican fire opal, because Mexico is one of its prime sources.

Aztec Gold
Fire opal was known to the Aztecs between about 1200 to 1519 AD.

You may wish to check the attributes of gemstones on our Gemstone Characteristics page.

The hardness of fire opal is 5.5 to 6.5.

Technical Details
Chemical Composition and NameSiO2nH2O - Hydrous Silicon Dioxide
Hardness5.5 to 6.5
Refractive Index1.44 - 1.47
Specific Gravity1.95 - 2.20
Crystalline SystemGel
Other Optical PropertiesIsotropic



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