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Pseudomesolite is mesolite

Published online by Cambridge University Press:  05 July 2018

Rab Nawaz ,
John F. Malone  and
Victor K. Din
Rab Nawaz
Affiliation:
Department of Geology, Ulster Museum, Belfast BT9 5AB
John F. Malone
Affiliation:
Department of Chemistry, Queen's University, Belfast
Victor K. Din
Affiliation:
Department of Mineralogy, British Museum (Nat. Hist.), London SW7 5BD
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Abstract

Pseudomesolite from Carlton Peak, described by Winchell (1900), is shown to be mesolite by means of chemical and X-ray data. A proposal to this effect has been accepted by the International Mineralogical Association's Commission on New Minerals and Mineral Names. Electron microprobe analysis revealed variations in the composition of pseudomesolite and showed the presence of faroelite. The X-ray powder diffraction pattern is similar to that of mesolite. Single-crystal Weissenberg photographs showed a twinning intergrowth which is explained by a 90° rotation of 50% of the unit cells about the c-axis, so that the a- and b-axes of rotated cells coincide with the b- and a-axes respectively of the unrotated cells. This twinning can not be detected optically. Mesolite has recently been proved to be orthorhombic, contrary to the long-held view that it is monoclinic.

Pseudomesolite from Oregon is also shown to be mesolite by single crystal Weissenberg photographs. A wet chemical analysis shows this material to be extremely silica-rich.

Keywords

mesolitepseudomesolitezeoliteCarlton PeakMinnesotaOregon
Type
Research Article
Information
Mineralogical Magazine , Volume 49 , Issue 350 , March 1985 , pp. 103 - 105
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985 

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