Structure 9001998

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Citation: Oberti, R.; Hawthorne, F. C.; Camara, F.; Raudsepp, M. (1999). Unusual M3+ cations in synthetic amphiboles with nominal fluoro-eckermannite composition: Deviations from stoichiometry and structural effects of the cummingtonite component Sample: Cr2, Na1.00Na1.75Mg.25Mg4.25Cr.75Si8O22F2. American Mineralogist, 84, pp. 102-111.

Formula: Cr0.76 F2 Mg4.42 Na2.51 O22 Si8

Cell parameters:

  • a = 9.728 Å
  • b = 17.825 Å
  • c = 5.278 Å
  • α = 90°
  • β = 103.66°
  • γ = 90°

List type: noninterleaving

List: 3D

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Linear Graph Knot

Molecules

CIF datablock 0, entity 1 of 1

Basis: (1;0;0 0;1;0 0;0;1)

Dimensionality: 3

Formula: Cr4 F4 Mg18 Na4 O44 Si16 (Cr2 F2 Mg9 Na2 O22 Si8)

Multiplicity: 1

span 1 {1 1 1}