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Tacharanite and other hydrated calcium silicates from Portree, Isle of Skye

Published online by Cambridge University Press:  14 March 2018

Jessie M. Sweet ,
D. I. Bothwell  and
D. L. Williams
Jessie M. Sweet
Affiliation:
Department of Mineralogy, British Museum (Natural History)
D. I. Bothwell
Affiliation:
Department of Mineralogy, British Museum (Natural History)
D. L. Williams
Affiliation:
Department of Mineralogy, British Museum (Natural History)
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Summary

The vesicles of an olivine-dolerite that occurs as a small outcrop near Portree in the Isle of Skye contain zeolites and some hydrated calcium silicates. These latter include tobermorite, xonotlite, gyrolite, and what is presumed to be a new member of the tobermorite group. An attempt is made to account for the sequence of crystallization of the minerals.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 253 , June 1961 , pp. 745 - 753
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1961

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References

Page 746 Note 1 Mackay, A. L. and Taylor, H. F. W., Min. Mag., 1952, vol. 30, p. 84.Google Scholar

Page 746 Note 2 Taylor, H. F. W., Min. Mag., 1959, vol. 32, p. 110.CrossRefGoogle Scholar

Page 749 Note 1 Electron-diffraction work is being carried out by Dr. H. F. W. Taylor.

Page 749 Note 2 After ignition the mineral was not gelatinized by concentrated HCl and it was necessary to fuse it with Na2CO3.

Page 753 Note 1 The previous descriptions of Scottish tobermorite give very little information on the mode of occurrence-in fact Heddle only once mentions the parent rock as 'basic eruptive' in 'north-east Mull from Tobermory to Bloody Bay' ( Heddle, M. F., Min. Mag., 1880, vol. 4, p. 119 Google Scholar; The Mineralogy of Scotland, 1901, vol. 2, p. 83). Here the mineral is minutely granular and pale pink with a rim of mesolite and associated with xonotlite and gyrolite in neighbouring localities. His occurrence at Sgúrr nam Boc, Loch Eynort, Isle of Skye, shows material 'very arborescent and branching' with crystals that 'seem to obscure parallel to their length' ( Heddle, M. F., Trans. Geol. Soc. Glasgow, 1892, vol. 9, p. 254 Google Scholar).