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Roeblingite: new chemical data

Published online by Cambridge University Press:  05 July 2018

Pete J. Dunn ,
Julie A. Norberg  and
Peter B. Leavens
Pete J. Dunn
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, DC 20560, USA
Julie A. Norberg
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, DC 20560, USA
Peter B. Leavens
Affiliation:
Department of Geology, University of Delaware, Newark, Delaware 19711, USA
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Abstract

New chemical analyses of roeblingite from Franklin, New Jersey, and Långban, Sweden, are presented. The average composition of Franklin roeblingite is SiO2 24.9, CaO 23.8, SrO 2.4. MnO 2.4, PbO 30.2 SO3 10.4, H2O 6.13%, Sum = 100.23%. The data support space group C2/m and suggest the formula is (Ca,Sr)12 (Mn,Ca)2Pb4(SO4)4Si12O28(OH)20, if there is ordering on the site of rank 2.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 340 , September 1982 , pp. 341 - 342
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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References

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