Opalization.JPG (500 × 341 pixels, file size: 143 KB, MIME type: image/jpeg)
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|current||11:49, 16 April 2013||500 × 341 (143 KB)||Gsalwen1||reference: https://uwaterloo.ca/earth-sciences-museum/what-earth/what-earth-minerals/what-earth-precious-opal|
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