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Refinement of an Amesite-2H1 Polytype from Postmasburg, South Africa
Amesite-2H1 Distortions Ordering Patterns Postmasburg Refinement South Africa Twinning
2011/12/9
Abstract: The crystal structure of amesite-2H1 from the Postmasburg Mn ores of South Africa has been refined to R = 4.7% using Siemens P4 rotating-anode MoKα X-ray data and SHELXL-93 software. Partial...
Hydroxyl Orientations and Interlayer Bonding in Amesite
Amesite Fluorine Hydroxyl orientation Interlayer bonding Serpentine
2012/2/8
The hydroxyl orientations in the 2H2 polytype of amesite, Mg2Al(SiAl)O5(OH)4, have been determine by minimizing the electrostatic potential energy as a function of OH orientation. The angles, ρ, betwe...
Cation ordering in amesite-2H2 from Antarctica has reduced the true symmetry from the ideal hexagonal space group P63 to triclinic P1. All crystals show 6-fold biaxial twin sectors on (001), and the t...