| 31. | However, the finest red spinels can have a value approaching that of the average ruby.
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| 32. | Red spinels, red garnets, and colored glass have been falsely claimed to be rubies.
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| 33. | It may also be substituted by spinel or sodalite, or by dyed jasper or howlite.
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| 34. | This can be termed spinel hydrolysis.
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| 35. | Other possible minerals formed at dry conditions include sapphirine, spinel, sillimanite, and osumilite.
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| 36. | In meteorites it occurs with perovskite, melilite, hibonite, spinel and calcium rich pyroxene.
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| 37. | The confusion between spinel and taaffeite is understandable as certain structural features are identical in both.
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| 38. | :Looks like garnets ( or maybe a dark spinel ? ) to my untrained eye.
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| 39. | Initial production was based on a manganese spinel cathode, with batteries formed from laminated cells.
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| 40. | He suggested that most diamonds that had been produced up to that point were likely synthetic spinel.
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