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Pyroxene-ideal |
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Thompson R M, Downs R T |
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American Mineralogist 89 (2004) 614-628 |
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Model pyroxenes II: Structural variation as a function of tetrahedral rotation |
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model protopyroxene after Yang et al. (1999) |
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with O3-O3-O3 angle = 165.9 and model oxygen radius = 1.306 |
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Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience |
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_database_code_amcsd 0003523 |
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9.154 8.981 5.185 90 90 90 Pbcn |
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atom x y z |
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Mg 0 1/12 3/4 |
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Mg 0 .25 1/4 |
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Si .3082 1/12 1/12 |
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O1 .1335 1/12 1/12 |
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O2 .3665 .25 .1191 |
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O3 .3665 -.0179 .3155 |
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