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Note on a Pegmatitic Hornblende from the Carsphairn Complex

Published online by Cambridge University Press:  01 May 2009

W. A. Deer
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Extract

A Number of small pegmatitic patches occur in the development of the later stages of the hornblende hybrids of the Cairnsmore of Carsphairn Complex. These are best seen on the eastern side of the Gairy of Cairnsmore, and it is within these pockets of late residuum crystallization that this hornblende occurs. The pegmatites consist of milky quartz, greenish-black hornblende and a clove coloured sphene. The two latter minerals develop idiomorphic crystals. The hornblende, though usually only 1½ inch in length, occasionally grows to 1½ inches long in slender prismatic crystals showing the faces (100), (110), (110), (130), (130), (010), (011), and (011).

Type
Original Articles
Information
Geological Magazine , Volume 74 , Issue 8 , August 1937 , pp. 359 - 361
Copyright
Copyright © Cambridge University Press 1937

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References

page 359 note 1 Deer, W. A., “The Cairnsmore of Carsphairn Igneous Complex,” Quart. Journ. Geol. Soc., 91, 1935, 47–76.CrossRefGoogle Scholar

page 360 note 1 Warren, B. E., “The crystal structure and chemical composition of the monoclinic amphiboles,” Zeits. Kryst., 72, 1930, 493–517.Google Scholar

page 360 note 2 Warren, , op. cit., 512.Google Scholar

page 360 note 3 Warren, B. E., “The Structure of Tremolite H2Ca2Mg5(SiO3)8,” Zeits. Kryst., 72, 1929, 42–57.Google Scholar