The crystal structures of 2 M1 phengite and 2 M1 muscovite

Necip Güven

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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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.

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