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Weddellite in modern sediments, Florida

Published online by Cambridge University Press:  14 March 2018

C. Osborne Hutton  and
William H. Taft
C. Osborne Hutton
Affiliation:
Stanford University, California
William H. Taft
Affiliation:
University of South Florida, Florida
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Summary

Euhedra of weddellite have been recognized in modern, unconsolidated sediments collected from depths of water not exceeding one fathom, along the south-east coast of Florida. For weddellite, the following data have been determined: crystals simple with r {011} accompanied by a {010} in some cases; goniometric axial ratio is a:c = 1:0·593 (meas.), 1:0·5938 (calc.); a0 12·360 Å, c0 = 7·340 Å; space group I4/m, I4 or I4̅; α 1·529, γ = 1·544, δ = 0·015, uniaxial, positive; d22°C = 1·941. Heat treatment of weddellite led to development of whewellite, calcite, and calcium oxide in turn as higher temperatures were employed; fully indexed X-ray diffraction powder data are given for weddellite, in addition to d-spacings and intensities for whewellite.

It is suggested that weddellite developed in the calcareous Florida sediments under conditions of storage over a two-year period, and ahnost certainly was not a constituent of those sediments at the time of collection. This raises the question whether weddellite was present in the Weddell Sea material at the actual time they were recovered by members of the Scotia Expedition.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 256 - 265
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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