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Supplementary Note on Felspar from Kilima-njaro

Published online by Cambridge University Press:  14 March 2018

L. Fletcher  and
H. A. Miers
L. Fletcher
Affiliation:
Mineral Department, British Museum
H. A. Miers
Affiliation:
Mineral Department, British Museum
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Extract

A Chemical analysis of this felspar, to which our attention was directed by Professor Bonney, and which was subsequently described on crystallographic and optical grounds as orthoclase, shows it to be a sodapotash felspar of somewhat peculiar composition.

In the following table, the first two columns give the results obtained on analysis (Fletcher) of two loose crystals, of which the second was a twincrystal of lighter eolour than the first; the next two columns represent the same analyses if the oxide of iron (present as visible enclosures) and the loss on ignition are neglected; the numbers in the fifth column are obtained by taking the means of the numbers in the two preceding columns.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 7 , Issue 34 , July 1887 , pp. 131 - 132
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1887

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References

page 131 note 1 Bonney. Rep. Brit. Ast. 1885, p. 682.

page 131 note 2 Miers. Min. Mag. vii. p. 11.

page 131 note 3 Brögger. Die Siluruchen Stagen 2 und3. 1882, p. 261.

page 131 note 4 Mügge. Neues Jahrbuch. 1881 (2), p. 106.

page 132 note 1 Deville, . Comptes Rendus, 19, 1844, p. 46 Google Scholar.

page 132 note 2 Bammelsberg, . Min. Chem. 1875, ii. p. 569 Google Scholar.

page 132 note 8 Förstner, . Zeits.f. Kryst. viii. 1884, p. 125 Google Scholar.

page 132 note 4 Bosenbusch. Mikro. phys. 1885, p. 650.

page 132 note 5 Neues Jahrbuch. Beil. Bd. 4, 1886, p. 291.