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Isomorphism as illustrated by certain varieties of Magnetite

Published online by Cambridge University Press:  14 March 2018

B. J. Harrington
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Extract

Some years ago the writer received from St. Joseph du Lac in the County of Two Mountains, province of Quebec, Canada, a few small specimens of a black mineral which was identified as magnetite. Later, a more careful inspection of the fragments, which weighed from tell to fifteen grams each, showed that some of them were portions of crystals made up of an unusual combination, the octahedron {111} and a trapezohedron {311}. Further, chemical analysis showed that the composition was specially interesting, the mineral being titaniferous and containing, besides 3.24 per cent. of magnesia, a larger proportion of manganese than had been observed in the case of anymagnetite previously examined.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 14 , Issue 67 , September 1907 , pp. 373 - 377
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1907

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References

Page 374 note 1 Knop, A., ‘Ueber titansäurehaltigen Magneteisenstein.’ Annalen der Chemio (Liebig), 1862, vol. cxxiii, pp. 848-53.Google Scholar

Page 377 note 1 Many years ago Professor G. A. Koenig examined nodular masses of magnetite from Magnet Cove and found them to be titaniferous and also to contain a little vanadium (V2O3 = 0.17). It was the writer's intention to examine the crystals for vanadium, but owing to want of time this has not been done. For Professor Koenig's analysis see Proc. Acad. Nat. Sci. Philadelphia, 1877, p. 293.