This common opal's geological occurrence is unknown, but GIA researchers were able to identify the presence of chromite, hercynite, and spinel with LA-ICP-MS and Vis-NIR tests. Colored stones can be full of surprises.
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Showing posts with label Common Opal. Show all posts
Showing posts with label Common Opal. Show all posts
Monday, April 19, 2021
Chromite Inclusions In Green Common Opal
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