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- W2102912302 abstract "The crystal structure of a pegmatitic monoclinic potassium feldspar, (IG Nao rnno nn) (Si,,*Al'*) t0*(OH)o.1, from the Himalaya mine in the Mesa Grande pegmatite district, California, has been refined with 3-dimensional neutron-diffraction data to an unweighted R value of 0.031 for 721 symmetry-independent observed reflections. Atomic coordinates differ by no more than 3 estimated standard deviations from those of Spencer B adularia, yet the specimen does not have the adularia morphology, and no diffuse reflections with (h + k) odd have been observed. Direct refinement of the tetrahedral cation distribution shows that the Al content of the T(2) sites is not significantly different from zero (actually -0.016 with an e.s.d. of 0.029); in other words the Al-Si ordering in the tetrahedral sites is essentially complete. The mean SiO distance in the T(2) sites is 1.616A, appreciably greater than the values predicted by various regression lines relating bond distance to aluminum content. This indicates that the observed mean T,(m)-O, ?,(O)-O, and Tn(m)-O bond lengths reported for low albite and maximum microcline are consistent with full Si occupancy. This ordered orthoclase occurs in gem pockets in a microcline-bearing pegmatite. The association suggests stable growth of ordered orthoclase above the field of stability of microcline and metastable persistence to lower temperatures. Perhaps because of more rapid crystal growth, the bulk of the pegmatitic K-feldspar ordered to common orthoclase, then transformed to maximum microcline." @default.
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- W2102912302 date "1973-01-01" @default.
- W2102912302 modified "2023-09-27" @default.
- W2102912302 title "Neutron Diffraction Refinement of an ordered orthoclase Structure" @default.
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