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Opal-Gemstones

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Group: Quartz
Hardness: 5,5-6,5
Specific Gravity: 2-2,20
Crystal System: amorphous materia
Index of Refraction : 1,430-1,460
Transparency: from nearly translucent to opaque


Quartz is composed of a hydrated silicon gel. color ranges are white, grey, blue, green, orange, pink, and black. There are three varieties of Opal: Common Opal, transparent Fire Opal (yellow, orange, and red), and Precious Opal, characterized by a play-of-color known as Mosaic or Arlequin.
Mining sites are located in Australia, Mexico, Nevada (U.S.A), Sri Lanka..

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