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Tin-containing andradite from Plavno mine in the Krušné Hory Mts., Czechoslovakia

Published online by Cambridge University Press:  14 March 2018

V. Dadák  and
F. Novák
V. Dadák
Affiliation:
Institute for Ore Research, Praha, Czechoslovakia
F. Novák
Affiliation:
Institute of Mineral Raw Materials of Kutná Hora
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Summary

Stannian andradite occurs with pyroxene and carbonates, with blende and pyrite as accessories in a skarn deposit in the Plavno mine, Krušné Hory Mts., NW. Bohemia. The green crystals are rhombic dodecahedra up to 3 cm in size. Sp. gr. 3·78; n 1·879; a 12·079±0·002 Å. Quantitative chemical and spectrographic analyses are given; the composition is (Ca2·96Mg0·04Mn0·02)3·02 (Si2·95Sn0·04)2·99O12. The content of tin (SnO2 1·07 %) is isomorphously bound in the lattice, and according to crystallochemical calculations the entrance of tin into the garnet lattice is most probably due to substitution of The presence of tin in the andradite shows that this element was already present in the metasomatic solutions during the process of skarnization.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 270 , June 1965 , pp. 379 - 385
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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