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Opal - Wikipedia
Boulder Opal Information - Magical colors in an organic frame
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Opal Rock Photograph by Natural History Museum, London/science Photo Library
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/GettyImages-148547141_high-56a554bd3df78cf77287a7d2.jpg "10 Interesting Facts About the Opal")
10 Interesting Facts About the Opal
Opal: The mineral Opal (black, white, fire) information and pictures
Precious Opal and Its Play-of-Color
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An Introduction To Opal - Down to Earth Opals
Opal Quality Factors | Types of Opal | GIA
![34 CTS SOLID BLACK OPAL+HOST ROCK SPECIMEN [595cts]](https://df2sm3urulav.cloudfront.net/tenants/oa/uploads/images/365000-369999/366542/366542_1365735599.jpg "34 CTS SOLID BLACK OPAL+HOST ROCK SPECIMEN [595cts]")
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Opal | Geoscience Australia
Opal - Wikipedia
Types of Opal With Photos
Village Smithy Opals
Opal on Mother Rock From Lightning Ridge-australia | Etsy
