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Verfeinerung der Kristallstruktur von Anthophyllit vom Ochsenkogel/Gleinalpe, Österreich
Published/Copyright:
August 25, 2010
Abstract
The crystal structure of anthophyllite Na0.01Ca0.02Mg5.71-Fe1.24Mn0.02(Si7.95Al0.05)O22(OH)2 has been refined by single crystal X-ray methods using 1316 independent reflections. The space group is Pnma with the unit cell dimensions a = 18.544(2) Å, b = 18.026(2) Å, c = 5.282(1) Å and V = 1765.6(4) Å3, Z = 4. Chemical and optical data are given. The refinement of the atomic parameters and of the cation distribution gives final values of R = 0.034 and Rw = 0.035. The M sites show a high degree of Mg and Fe cation ordering. M2 is only occupied by Mg and M1, M3 also contain very little iron. M4 is greatly enriched in iron: 0.62 Fe and 0.38 Mg. The coordination of M4 is highly irregular with five next oxygens and two longer M4 – O distances. The A site is found to be empty.
Published Online: 2010-08-25
Published in Print: 1989
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Articles in the same Issue
- Limits of isomorphous substitution of CnH2n + 2 chains in paraffins as a function of temperature
- Crystal structure analysis from powder diffraction data
- Intensitätsstatistik für Strukturen mit Überstruktureffekten
- Crystal and molecular structure of 10-methoxy-8, 8-dimethyl 2H,8H-benzo (1,2-b:5,4-b′-dipyron-2-one) (Luvangetin)
- Crystal structure of a complex of glycine with zinc chloride
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- Präzisionsbestimmung des Skalierungsfaktors für Relativwerte von Strukturamplituden mit Messung von Absolutintensitäten an Pulverpräparaten
- The X-ray revised stereochemistry of the hydroperoxide of atractyligenin
- Crystal structures of N-benzylcarbonyl-α-aminoisobutyric acid mono- and tripeptide methyl ester derivatives
- The crystal structure of U4Ni5Al18
- The crystal structure of Cs2Nd(N3)5
- The crystal structure of Tl5Te3 and its relationship to the Cr5B3 type
- A phosphorous ylide with a secondary P…O bond. The crystal structure of a-[6-furazano][3,4-b]-quinoxalinyl-a-carbethoxymethylenetriphenylphosphorane(butene-2,3,4-dimethylhexene-3)solvate
- New data for 2-thiophenecarboxylic acid
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