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On Strüverite from the Federated Malay States

Published online by Cambridge University Press:  14 March 2018

T. Crook  and
S. J. Johnstone
T. Crook
Affiliation:
Scientific and Technical Department, Imperial Institute
S. J. Johnstone
Affiliation:
Scientific and Technical Department, Imperial Institute
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Extract

The mineral dealt with in this paper was sent for examination the Imperial Institute by Mr. J. B. Scrivener, Government Geologist to the Federated Malay States. It occurs on the river Sebantun, about half a mile above Salak North village, Kuala Kangsar district, Perak. The ground on which it was obtained was held on a tin-mining lease, but had to be abandoned owing to the presence of the unknown mineral, which rendered mining unprofitable.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 16 , Issue 75 , May 1912 , pp. 224 - 231
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1912

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References

Page 224 note 1 Prior, G. T. and Zambonini, F., ‘On strüverite and its relation to ilmenorutile,’ Mineralogical Magazine, 1908, vol. xv, pp. 78–89 CrossRefGoogle Scholar.

Page 225 note 1 Hess, F. L. and Wells, R. C., ‘An occurrence of strüverite,’ Amer. Journ. Sci., 1911, ser. 4, vol. xxxi, pp. 482–442Google Scholar.

Page 226 note 1 As indicated by compensation with a gypsum-plate, the maximum-absorption vibration-direction is that of the slow ray ; and as indicated by the pleochroism it is also the vibration-direction of the extraordinary ray.

Page 226 note 2 My thanks are due to Mr. J. Shelton, A.I.C., Assistant in the Scientific and Technical Department of the Imperial Institute, for valuable assistance rendered in connexion with the analysis of strüverite.—S. J. J.

Page 228 note 1 Giles, W. B., Chem. News, 1907, vol. xcv, p. 37 Google Scholar.

Page 228 note 2 Metzger, F. J. and Taylor, C. E., School of Mines Quarterly, New York, 1909, vol. xxx, p. 828 Google Scholar.

Page 229 note 1 Crookes, W., Phil. Trans. Roy. Soc. London, 1908, ser. A, vol. ccix, p. 17 Google Scholar.

Page 229 note 2 A specimen of orthite has since been described as containing 0-8-1.0 percent of scandia ; see R. J. Meyer, ‘Ueber einen scandiumreichen Orthit aus Finnland und den Vorgang seiner Verwitterung,’ Sitzungsber. Akad. Wiss. Berlin, 1911, pp. 379-884. Still more recently, a new mineral supposed to consist essentially of scandium silicate, and to contain about 37 per cent. of scandia, has been described ; see Schetelig, J., ‘Ueber Thortveitit, ein neuoa Mineral,’ Centralblatt Min., 1911, pp. 721–726 Google Scholar.

Page 230 note 1 This percentage was divided equally between the niobic and tantalic oxides to accord with a rough indication that these two oxides were present in approximately equal amounts. It seems highly probable, however (see below), that there was a subltantial preponderance of tantalic oxide.

Page 231 note 1 The stannic oxide in the Perak specimen as analysed is present, in part at least, as free cassiterite ; and the silica as quartz granules.

Page 231 note 2 Assuming the following specific gravities: rutile 4.2, tapiolite 7.35, cassiterite 7.0, quartz 2-65, water 1.