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IV.—On the Microscopic Structure of the Pitchstones and Felsites of Arran

Published online by Cambridge University Press:  01 May 2009

S. Allport
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Extract

In my last communication. I gave some account of all the varieties of Arran pitchstones then known to me, and referring to other closely allied rocks, intimated an intention of describing them on another occasion.

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 102 , December 1872 , pp. 536 - 545
Copyright
Copyright © Cambridge University Press 1872

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References

page 536 note 1 See Geol. Mag. Vol. VIII. pp. 448–450.

page 536 note 2 Zeits. d. d. geol. Ges., xxiii., p. 1.

page 540 note 1 In No. I. 2·37 was lost in water bath.

page 540 note 2 The whole of the iron in No. I. was found “to be in the state of ferrous oxide, and that fact is sufficient evidence that the manganese exists as manganous oxide.” It is worthy of remark, that the felsitic portion of the rock contains more silica than the pitchstone, a result quite in accordance with that obtained by microscopic examination.

page 540 note 3 Geol. of Arran, p. 77.