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Staringite, a new Sn–Ta mineral from north-eastern Brazil

Published online by Cambridge University Press:  05 July 2018

E. A. J. Burke ,
C. Kieft ,
R. O. Felius  and
Maria S. Adusumilli
E. A. J. Burke
Affiliation:
Institute for Earth Sciences, Free University, Amsterdam
C. Kieft
Affiliation:
Netherlands Organization for the Advancement of Pure Research
R. O. Felius
Affiliation:
Geological and Mineralogical Institute, University of Leiden
Maria S. Adusumilli
Affiliation:
Escola de Geologia, Recife
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Summary

Staringite, (Fe,Mn)0·5(Sn,Ti)4·5(Ta,Nb)1·0O12, occurs as inclusions in tapiolite from pegmatites at Seridózinho and Pedra Lavreda, Paraiba State, NE. Brazil. An indexed powder pattern is presented. The mineral is tetragonal with a 4·742 Å and c 9·535 Å, and most probably has a ‘trirutile’ structure. Electron-microprobe analysis yielded Ta2O5 21·5%, Nb2O5 1·8, SnO2 73·3, TiO2 0·03, FeO 3·7, MnO 0·3, sum 100·6%. Dcalc 7·17. Micro-indentation hardness (load 100 g) 1033–1187 kg/mm2; reflectivity at 470 nm (R0) 12·8 to (R′e) 14·5%, at 546 nm 12·1–13·9, at 589 nm 12·0–13·7, and at 650 nm 11·8–13·6; staringite is uniaxial positive.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 288 , December 1969 , pp. 447 - 452
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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