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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

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.


Useful link: https://www.gia.edu/gems-gemology/winter-2020-labnotes-opal-chromite-inclusions