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Even the famous Black Prince Ruby in the British Imperial State Crown is actually a spinel , not a ruby.
The spinels have low Mg number in comparison with Alpine-type peridotites, suggesting hydrothermal alteration in which Cr is preferentially retained in spinel.
At both Bald Knob and Hutter, rhodonite is absent in samples containing manganese spinels or manganese humites.
UCLA's Kyte, who himself favored a fireball origin for the spinels , has measured the chemical composition of hundreds of spinel samples from around the world.
Examples of coexisting spinels in chemical equilibrium are uncommon at Hutter.
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