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Notes on some Binnenthal minerals (Ilmenite, Seligmannite, Marrite, &c.)

Published online by Cambridge University Press:  14 March 2018

R. H. Solly
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Extract

Some very brilliant and well-modified crystals of ilmenlte, recently found in the neighbourhood of the Ofenhorn, are of interest in that they exhibit a well-marked parallel hemihedrism and show the presence of a number of new forms. Although constantly sought for, it is more than fifteen years since crystals of this mineral were last found in the Binnenthal. The crystals described by H. Bücking in 1877 appear to differ in habit from those of the new find.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 14 , Issue 65 , May 1906 , pp. 184 - 190
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1906

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References

Page 184 note 1 The crystal described above, and the specimen from which it was taken, have been acquired by the British Museum. The crystal was measured on the three-circle goniometer by Mr. G. F. Herbert Smith, and the following additional new forms were observed :—q = {3̅31} = {6̅241}, k = {4̅52} = {3̅1̅21}, Γ = {31̅1̅} = {404̅1}, and d = {411} = {101̅2}. The faces were in all eases small, but gave distinct reflections of the collimator-slit. The measurements were made from the large basal plane c = {111} = {0001}, and the azimuths were determined from the nearest, zone containing a pole of the form a = {101̅}={112̅0}. The calculated values were computed from Koksharov's fundamental angle adopted in Dana's ‘System of Mineralogy,’ 6th edit., 1892.

Page 184 note 1 Zeits. Kryst. Min., 1877, vol. i, p. 576.

Page 185 note 1 Calculated from the element of Koksharov, N. I., ‘Materialien zur Mineralogic Russlands,’ 1870, vol. vi, p. 857 Google Scholar.

Page 186 note 1 Baumhauer, H., Sitz.-ber. Akad. Wiss. Berlin, 1901, p. 110 Google Scholar; 1902, p. 611. Solly, R. H., Min. Mag., 1903, vol. xiii, p. 336 CrossRefGoogle Scholar; 1905, vol. xiv, p. 82.

Page 189 note 1 The rathite crystal is similar to that represented in fig. 5, Min. Mag., 1901, vol. xiii, Plate III.