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Notes on the optical characters of the Globules and Spherulites of Lithium Phosphate and some other salts

Published online by Cambridge University Press:  14 March 2018

C. A. McMahon
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Extract

In my paper "On the Micro-chemical Analysis of Rock Making Minerals, '' I noticed the abnormal behaviour of globules of lithium phosphate Li3PO4 + H2O in polarised light; the dark cross which ought to remain fixed when the globule is revolved between crossed nicols, opening up, in some cases, into two hyperbolic branches like those of a biaxial crystal in converging polarised light. I find that similar ano. malous results may be obtained from the globules yielded by other salts; as for example those of the double sulphates of beryllium and potassium (BeSO4K2SO4 + 2H2O), and of lithium and sodium (LiNaSO4).

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 10 , Issue 47 , November 1893 , pp. 229 - 233
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1893

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References

Note

1 Min. Mag., Vol X. p. 79.