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The nature of carphosiderite and allied basic sulphates of iron

Published online by Cambridge University Press:  14 March 2018

A. A. Moss
A. A. Moss*
Affiliation:
Department of Mineralogy, British Museum (Natural History)
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Summary

The composition of carphosiderite has been given as

H2O.Fe3(SO4)2(OH)5H2O

and like the jarosites is characterized by a ferric iron to sulphate ratio of 3:2. It is significant not only that this formula was worked out on artificial material but also that none of the analyses so far made supports it. The present investigation shows that there is little or no evidence for the existence of a mineral with the above composition and that carphosiderites are in reality either jarosite or natrojarosite. It has long been thought that certain other minerals, namely borgströmite, utahite, cyprusite, pastréite, raimondite, apatelite, and planoferrite, were similar to, if not identical with, carphosiderite and six of these are listed with carphosiderite in Dana, Syst. Min., 7th edn. These minerals with the exception of planoferrite and the possible exception of apatelite are also jarosite or natrojarosite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 236 , March 1957 , pp. 407 - 412
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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References

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page 408 note 4 This is the formula for carphosiderite.

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page 411 note 1 From X-ray data, this was shown to be goethite.

page 411 note 2 Loc. eit.

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