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XIII. The Geognosy and Mineralogy of Scotland

Published online by Cambridge University Press:  14 March 2018

Heddle
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Extract

This lies to the south of Unst ; it is interesting as forming the connecting link which unites the rock masses of Fetlar with those of Unst.

Its western extremity is composed of diallagic rocks, containing crystals of that mineral (Hb) very inferior to those of Balta : its middle portion consists of various rocks of the "chloritic series" ; towards the east there is seen a bed of graphitic slate (H) quite similar to, and doubtless the continuation of one which appears near Trista V oe in Fetlar.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 2 , Issue 10 , September 1878 , pp. 106 - 133
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1878

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References

Page 119 Note * "The Hensbarrow Granite District," Lake & Lake, Truro, 1878.

Page 120 Note * From information received from the Rev. David Webster, who writes the author, that it probably was derived from a valley to the north-west called the Dullans, from whence a stream runs into the lake. The high state of the lake prevented the author from obtaining the sand, and he is indebted to Mr. Webster for the supply which he examined and analysed. Mr. Webster also sent it in larger grains from the east shore of Trista Voe.

Page 120 Note † Mr. Webster, from observations on the spot, came to the same conclusion.

Page 122 Note * Both of these varieties of diallage are eminently worthy of being analysed. The writer was unable to visit this spot, the captain declining to risk the vessel in the westerly bay of Urie.

Page 125 Note * Since the above was written a dark schist, probably the same, has been found at Skuda sound, by Mr. Horne of the Geological Society.

Page 127 Note * Mineralogical Travels.

Page 130 Note * The crystals had a double tier of circumvallations as in the figure 1.

Page 130 Note † In enumerating the minerals to be found at Swinaness, in Unst, I omitted chrysotile. It occurs in specimens of a yellow colour, in association with Brucite.

A correction has been issued for this article:

Errata