Abstract The crystal structure of pyrope, Mg 3 Al 2 Si 3 O 12 , was refined by the X-ray diffraction method with anharmonic thermal vibration considered, applying the Gram-Charlier series expansion up to the fourth-rank tensors ( R = 0.015 for 688 reflexions). A positive electron density residue due to bonding electrons 0.7 eÅ −3 in height was observed between the silicon and oxygen atoms. Crystal data: (Natural specimen from Parigi, Martiniana Po, Cuneo, Italy; Cubic garnet structure; Ia (unk) d ; Z = 8; a o = 11.4582(6) Å; V = 1504.35 Å 3 ; D x = 3.560 g cm −3 ; μ = 11.88 cm −1 ; λ (Mo Kα ) = 0.71069 Å, F (000) = 1600; T = 296 K).
Zeitschrift für Kristallographie - Crystalline Materials – de Gruyter
Published: Jan 1, 1993
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