Scientists figure out origin of cobalt-blue spinel in Canada's Arctic

Small spinel stones with good transparency and fine cobalt-blue colour can sell for about 10 times the price of a comparable sapphire.

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The two scapolite spectra (left) and SAM mapping results (right) from

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Spinel - Wikipedia

Applied Sciences December-1 2023 - Browse Articles

Salt (chemistry) - Wikipedia

Ridiculously rare gemstones found in Northern Canada - The Weather Network

Sodalite: The rare blue mineral used as a gem.

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Spinel Color and Magnetism, Blue Spinel and Cobalt Spinel