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Magnesian Tourmaline from Renfrew, Ontario

Published online by Cambridge University Press:  14 March 2018

E. L. Bruce
E. L. Bruce*
Affiliation:
Geological Survey of Canada
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Extract

The specimens of the mineral examined were obtained from a limestone quarry near the town of Renfrew. The tourmaline occurs near the contact of grey granite-gneiss and crystalline limestone of the Grenville series. The gneiss is intrusive into the limestone, and contact effects are observable both in the intrusive and in the intruded rock. The gneiss consists of quartz, plagioclase, micrccline, and a green pyroxene. The limestone is composed (almost entirely) of calcite, but contains some graphite. The secondary minerals occurring in both limestone and gneiss are, besides the tourmaline, pyrrhotite, titanite, and muscovite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 18 , Issue 84 , June 1917 , pp. 133 - 135
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1917

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References

page 134 note 1 The total iron reckoned as ferrous oxide corresponds with FeO 2·81 per cent.

page 135 note 1 Penfield, S. L. and Foote, H. W., 'On the chemical compoeltion of tourmaline', Amer. Journ. Sci., 1899, ser. 4, vol. vii, pp. 97–125 CrossRefGoogle Scholar.