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New data for lansfordite

Published online by Cambridge University Press:  05 July 2018

R. J. Hill ,
J. H. Canterford  and
F. J. Moyle
R. J. Hill
Affiliation:
CSIRO Division of Mineral Chemistry, PO Box 124, Port Melbourne, Victoria 3207, Australia
J. H. Canterford
Affiliation:
CSIRO Division of Mineral Chemistry, PO Box 124, Port Melbourne, Victoria 3207, Australia
F. J. Moyle
Affiliation:
CSIRO Division of Mineral Chemistry, PO Box 124, Port Melbourne, Victoria 3207, Australia
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Abstract

Euhedral crystals of the low-temperature mineral lansfordite, MgCO3 · 5H2O, have been prepared from saturated magnesium bicarbonate solutions at temperatures below 10°C. The crystals are monoclinic P21/a with a = 12.4758(7), b = 7.6258(4), c = 7.3463(6)Å, β = 101.762(6)°, V = 684.24Å3, Dcalc. = 1.693 g cm−3, Dobs. = 1.70(1) g m−3. At room temperature, the crystals slowly effloresce to produce pseudomorphs of nesquehonite, MgCO3 · 3H2O. Dehydration is complete at 300°C, with decarbonation taking place in the interval to 560°C. A new X-ray powder diffraction pattern is presented, and details of the infra-red absorption spectrum are discussed.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 341 , December 1982 , pp. 453 - 457
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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