The crystal structures of 2 M1 phengite and 2 M1 muscovite
Abstract
The crystal structures of 2 M1 phengite and 2 M1 muscovite have been refined by least-squares methods using single-crystal diffractometer data. Final discrepancy factors were unweighted R = 0.045 for 2 M1 phengite and 0.035 for 2 M1 muscovite. Both specimens have the space group C 2/c and the following cell dimensions at room temperature:
2 M1 phengite 2 M1 muscovite
a 5.2112 ± 0.0003 Å 5.1906 ± 0.0002 Å
b 9.0383 ± 0.0004 9.0080 ± 0.0003
c 19.9473 ± 0.0006 20.0470 ± 0.0006
β 95.769 ± 0.005° 95.757 ± 0.002°.
In 2 M1 muscovite tetrahedral cation-oxygen distances T1–O = T2–O = 1.643 Å show that there is no ordering of (Si,Al) over the tetrahedral site. In the structure of 2 M1 phengite, however, the corresponding values, T1–O = 1.622 and T2–O = 1.633 Å, indicate a very slight ordering. The framework of anions is distorted twice as much in 2 M1 muscovite than in 2 M1 phengite.
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- Die Molekular- und Kristallstruktur von trans-δ-[p-Methoxystyryl]-4-methoxy-α-pyron (Yangonin) C15H14O4 *
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- The force field of K feldspar
- Crystal structure of l-prolyl-l-phenylalanine-o-methoxy hydrobromide*
- The crystal structure of the mono-potassium salt of l-aspartic acid dihydrate
- Influence of heat-treatment on the average structure of Mg[Al2Si3O10], a stuffed derivative of the high-quartz structure *
- Protoenstatite: a crystal-structure refinement at 1100°C
- Electrostatic energy calculations of diaspore (α AlOOH), goethite (α FeOOH) and groutite (α MnOOH)
- U–O bond lengths and force constants in some uranyl minerals
- The crystal structure of 2,3,4,4-tetrachloro-1-keto-naphthalenedihydride at −160°C,
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