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A graphic method for the comparison of minerals with four variable components rearming two isomorlohous pairs1

Published online by Cambridge University Press:  14 March 2018

Edward S. Simpson
Edward S. Simpson*
Affiliation:
Geological Survey of Western Australia
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Extract

Graphic methods are often of the greatest assistance in bringing out the affinities of closely related minerals and particularly of members of isomorphous series. An illustration of the use of such a method in the case of a series involving three variables, all of them mutually replaceab]e, has already been given by the author in dealing with minerals of the tapiolite-mossite-rutile series. Recently, in studying a mineral of the spinel group, occurring in serpentine country near Namban, in the South-Western Division of Western Australia, it was found convenient to use a graphic method to bring out its relationship to the type minerals spinel, hercynite, and chromite, and to the intermediate minerals previously described under the names of picotite, chrompicotite, magnesiochromite, and magnochromite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 19 , Issue 91 , December 1920 , pp. 99 - 106
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1920

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Footnotes

1

Published by permission of the Government Geologist of Western Australia.

References

page 99 note 2 Simpson, E. S., On tapiolite in the Pilbara goldfield, Western Australia. Mineralog. Mag. 1917, vol. 18, pp. 118–121 CrossRefGoogle Scholar.

page 100 note 1 New name required to complete the series and to designate already known minerals. Vide infra (p. 104).

page 100 note 1 Rammelsberg, C. F., Handbuch der Mineralehemie, 2nd ed., 1875, pt. 2, p. 142 Google Scholar.

page 100 note 2 J. D. Dana, System of Mineralogy, 5th and 6th eds., 1868 and 1892.

page 100 note 3 Lacroix, A., Mineralogie de la France, 1910, vol. 4, p. 312 Google Scholar.

page 103 note 1 Numerical ratio neglecting algebraic sign. Without this third ratio there would be overlapping of the second and third sub-species in each species.