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On Bassetite and Uranospathite, new species hitherto classed as Autunite

Published online by Cambridge University Press:  14 March 2018

A. F. Hallimond
A. F. Hallimond*
Affiliation:
Museum of Practical Geology, London
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Extract

The name autunite was originally g!ven to the well-known mineral from Autun, but it would seem that no crystals of this material have been found that would afford measurements oi1 the goniometer. As the result of optical examination Des Cloizeaux (2) concluded that the mineral was biaxial, and he observed further that the angle decreased when the specimen was heated (6); the extinction was apparently straight, and he therefore referred the trysts,Is to the rhombic system ; with the contact goniometer he found mm'=90°48'.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 17 , Issue 81 , September 1915 , pp. 221 - 236
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1915

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References

page 222 note 1 The author takes this opportunity of expressing his thanks to Dr. H. H. Thomas and Mr. W. F. P. McLintock tbr their advice in this work.

page 222 note 2 No. L 1946, Museum of Practical Geology (Ludlam Collection).

page 224 note 1 No. L 1986, Museum of Practical Geology (Ludlam Collection).

page 225 note 1 No. 1297, Mineralogical Museum, Cambridge (Brooke Collection).

page 225 note 2 For convenience, the crystal is here viewed from the negative end of the b-axis.

page 228 note 1 Examples of similar twins are given by O. Mugge, Fortschritte der Min., 1911, vol. i, p. 42.

page 229 note 1 Evans, J. W., Mineralogieal Magazine, 1911, vol. xv, p. 393 Google Scholar.

page 230 note 1 No. L 1941, Museum of Practical Geology (Ludlam Collection).

page 231 note 1 Specimen No. L 1901, Museum of Practical Geology (Ludlam Collection).

page 232 note 1 Specimen No. L 1946, Museum of Practical Geology (Ludlam Collection).

page 234 note 1 From uranium and , a broad blade.