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The occurrence of rutile, brookite, and anatase on Dartmoor1

Published online by Cambridge University Press:  14 March 2018

Alfred Brammall  and
H. F. Hardwood
Alfred Brammall
Affiliation:
Imperial College of Science and Technology, London
H. F. Hardwood
Affiliation:
Imperial College of Science and Technology, London
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Extract

The occurrence of brookite aud anatase within the limits of the Dartmoor granite exposure was first indicated by a sample of stream-sand taken two years ago below the bridge at Dartmeet–a locality which is noteworthy for sands rich ill these and other accessory minerals of the Dartmoor granite.

Anatase, either alone or associated with brookite in small amounts, was found in a majority of the sands taken the following year at selected points along (1) the Plym River, between Cadover Bridge and Hatter Tor, (2) the East Dart and the West Dart, upstream from Dartmeet, (3) the West Webburn, upstream from Ponsworthy, (4) the East Webburn, upstream from Lizwell Meet, and (5) minor streams in the Hamel Down-Bonehill Down area. Rutile proved to be a rare mineral, liable to be overlooked in a residue containing brown cassiterite, from which it cannot readily be distinguished except by microchemical means.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 20 , Issue 100 , March 1923 , pp. 20 - 26
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1923

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Footnotes

1

This is the first of a series of papers on the Dartmoor granite of which a preliminary account was read before the Society on June 27, 1922.

References

Page 22 note 1 F. Rinne, 1911 [Min. Mag., vol. 16, p. 355]; O. Dreibrodt, 1912 [Journ. Chem. Soc., 1913, Abstr. ii, p. 868] ; V. M. Goldschmidt and E. Johnson, 1922 [Min. Abstr., vol. 2, p. 82].

Page 24 note 1 Dana's letters and indices tbr forms are used throughout.