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Some observations on the properties of dypingite, Mg5(CO3)4(OH)2·5H2O, and related minerals

Published online by Cambridge University Press:  05 July 2018

J. H. Canterford ,
G. Tsambourakis  and
B. Lambert
J. H. Canterford
Affiliation:
CSIRO, Division of Mineral Chemistry, PO Box 124, Port Melbourne, Vic, 3207, Australia
G. Tsambourakis
Affiliation:
CSIRO, Division of Mineral Chemistry, PO Box 124, Port Melbourne, Vic, 3207, Australia
B. Lambert
Affiliation:
Causmag International (Devex Limited), PO Box 438, Young, NSW, 2594, Australia
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Abstract

Dypingite, Mg5(CO3)4(OH)2·5H2O, was found in materials obtained during the production of high purity magnesia from crude magnesite by the calcination/CO2-leaching process. The snow-white, finely crystalline dypingite contained 41.0% MgO; the theoretical value is 41.5%. The X-ray powder data revealed a long period structure with a strong peak at 31.0 Å. The five strongest reflections (Å) and their estimated intensities (I/I0) were 10.4 (100), 31.0 (40), 15.62 (40), 5.86 (30), and 6.34 (20). The DTA curve showed ten endothermic reactions with maxima at 43, 50, 77, 86, 105, 127, 180, 260, 420, and 514°C and an exothermic reaction at 495°C.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 348 , September 1984 , pp. 437 - 442
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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Footnotes

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Author to whom correspondence should be addressed.

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