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Refinement of the Crystal Structure of Cronstedtite-1T

Published online by Cambridge University Press:  28 February 2024

Jiří Hybler ,
Václav Petříček ,
Slavomil Ďurovič  and
Ĺubomír Smrčok
Jiří Hybler*
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha 8, Czech Republic
Václav Petříček
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha 8, Czech Republic
Slavomil Ďurovič
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, 84236 Bratislava, Slovakia
Ĺubomír Smrčok
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, 84236 Bratislava, Slovakia
*
E-mail of corresponding author: [email protected]
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Abstract

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The crystal structure of cronstedfite-1T was refined in space group P31m, using two crystals: a triangular tabular crystal from Herja, Romania and a conical crystal from Lostwithiel, Cornwall, England. The Herja sample has the composition of (Fe2+2.20Fe3+0.80)(Si1.20Fe3+0.78Al0.02)O5(OH)4 and the Lostwithiel sample has the composition of (Fe2+2.32Fe3+0.68)(Si1.32Fe3+0.66Al0.02)O5(OH)4. The results of refinements are as follows: a = 5.512(1) Å, c = 7.106(1) A, R = 3.07%, and 342 independent reflections; and a = 5.503(1), c = 7.104(1) Å, R = 2.24%, and 335 independent reflections for the Herja and Lostwithiel samples, respectively. The structure consists of one tetrahedral and one octahedral sheet. There is one octahedral site, M1, occupied by Fe only, and one tetrahedral site, T1, occupied by Si and Fe in the ratio of 0.617(8):0.383 (Herja) and 0.699(6):0.301 (Lostwithiel). Positions of two hydrogen atoms were determined from a difference map for the Lostwithiel data. The ditrigonalization angle of the tetrahedral sheet is α = −11.5° (Herja) and α = −11.1° (Lostwithiel), and the structures have a Franzini-layer type of B. The crystals studied are affected by ± b/3 stacking faults which produced slight streaking of h - k ≠ 3n reflections.

Keywords

CronstedtiteLayer SilicateOrder-Disorder (OD)PolytypismX-ray Diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 3 , June 2000 , pp. 331 - 338
Copyright
Copyright © 2000, The Clay Minerals Society

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