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.
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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