| 21. | The Samarian Spinel has a hole in it.
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| 22. | The spinel structures have a twined orientation and are controlled by close packed sheets.
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| 23. | He first runs into Killian while in the middle of a dispute with Spinel.
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| 24. | Structurally, it bekongs to the spinel group.
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| 25. | The book contains images that document some of his spinel finds over the years.
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| 26. | Spinel structures consist of multiple oxide structures that are cubic and have cubic close packing.
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| 27. | Magnetite substituted for the original chromium spinel.
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| 28. | It is a member of the spinel group and a high pressure polymorph of chromite.
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| 29. | Cobalt-based spinels showed inferior kinetics to insertion compared to their behaviour with lithium.
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| 30. | Aluminium also occurs in the minerals beryl, cryolite, garnet, spinel, and turquoise.
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