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The crystal structure of klyuchevskite, K3Cu3(Fe,Al)O2(SO4)4, a new mineral from Kamchatka volcanic sublimates

Published online by Cambridge University Press:  05 July 2018

M. G. Gorskaya ,
S. K. Filatov ,
I. V. Rozhdestvenskaya  and
L. P. Vergasova
M. G. Gorskaya
Affiliation:
State University, Russia
S. K. Filatov
Affiliation:
State University, Russia
I. V. Rozhdestvenskaya
Affiliation:
LPO 'Burevestnik', Russia
L. P. Vergasova
Affiliation:
St.-Petersburg Institute of Volcanology, Academy of Sciences, Petropavlovsk-Kamchatsky, Russia
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Abstract

The crystal structure of klyuchevskite, K3Cu3(Fe,Al)O2(SO4)4, was determined in space group I2 using the total of 715 independent reflections up to R 0.12. Klyuchevskite is a structural analogue of piypite (caratiite) K4Cu4O2(SO4)4MeCl with the substitution K+ + Cu2+ → (Fe3+,Al) + MeCl. Compared to piypite, the ordering of Cu2+ and Fe3+ cations in the klyuchevskite structure results in the distortion of the unit cell and in lowering the symmetry of the chains to 1.

This brings about a more compact packing of the chains. The chain-like arrangement of the structure determines physical properties of the mineral, its acicular habit, perfect cleavage, strong anisotropy of optical properties and orientation of optical indicatrix.

Keywords

klyuchevskitecrystal structurepiypiteTolbachik volcanoRussia
Type
Crystal Structures
Information
Mineralogical Magazine , Volume 56 , Issue 384 , September 1992 , pp. 411 - 416
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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