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Even the famous Black Prince Ruby in the British Imperial State Crown is actually a spinel , not a ruby.
At both Bald Knob and Hutter, rhodonite is absent in samples containing manganese spinels or manganese humites.
His collection includes emeralds and spinels of a staggering size (some of them are nearly 300 carats).
The spinels have low Mg number in comparison with Alpine-type peridotites, suggesting hydrothermal alteration in which Cr is preferentially retained in spinel.
Legendary for its blood-red rubies and spinels , the Mogok stone tract of northern Myanmar also produces an amazing array of other minerals.
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