| 1. | While rubies are aluminum oxide, spinels are magnesium aluminum oxide.
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| 2. | At greater depth plagioclase is unstable and is replaced by spinel.
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| 3. | The transparent red spinels were called spinel-rubies or balas rubies.
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| 4. | The transparent red spinels were called spinel-rubies or balas rubies.
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| 5. | It is believed to be the second largest spinel in the world.
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| 6. | Some of these are glass, and others have spinel and pyroxene.
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| 7. | Spinels in the groundmass suggest that crustal contamination was extensive.
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| 8. | Yavorskyy became well-known after an increase in demand for spinel.
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| 9. | He also possesses one of the largest red spinel weighing 110 carat.
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| 10. | Microlites in the Lake unit rocks include biotite, plagioclase and spinel.
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