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Anauxite and Kaolinite Structures Identical

Published online by Cambridge University Press:  01 July 2024

S. W. Bailey and
R. B. Langston
S. W. Bailey
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, Madison, Wisc. 53706
R. B. Langston
Affiliation:
Department of Materials Science and Engineering, University of California, Berkeley, Calif. 94720
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Abstract

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Single crystal X-ray diffraction patterns reveal that the structure of selected anauxite crystals is the same as the structure of macroscopic kaolinite crystals. Anauxite and kaolinite crystals are intergrowths on a domain scale of units in pseudotwin orientations. Individual domains in anauxite have the triclinic geometry of kaolinite, and give X-ray reflections that compare closely in intensity with those calculated from the atomic parameters of kaolinite. Large crushed crystals of anauxite give powder patterns identical with that of kaolinite. Because it has been shown recently that the chemical composition of anauxite is also identical with that of kaolinite, it is recommended that the term “anauxite” no longer be used.

Резюме

Резюме

Картины монокристальной рентгеновской съемки показывают, что кристаллы аноксита, выделенные из его агрегатов, имеют ту же структуру, что и макроскопические кристаллы каолинита. Кристаллы аноксита и каолинита представляют сростки в доменной области, индивиды которых находятся в псевдодвойниковой ориентировке. Отдельные домены в аноксите имеют триклинную геометрию каолинита и дают рефлексы на рентгенограммах, которые по интенсивности сравнимы с вычисленными по атомным параметрам каолинита. Крупные дробленные кристаллы аноксита дают порошкограммы, аналогичные порошкограммам каолинита. Так как недавно было доказано, что аноксит и по химическому составу аналогичен каолиниту, то рекомендуется название “ансхоит” впредь не употреблять.

Information

Type
Research Article
Information
Clays and Clay Minerals , Volume 17 , Issue 4 , August 1969, pp. 241 - 243
Copyright
Copyright © 1969, The Clay Minerals Society

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