Summary
Thaumasite from the manganese mine of Tschwinning, South Africa, has the formula Ca3.097 Si1.062OH6.372(CO3)0.994(SO4)1.000·11.596 H2O. Unit cell parameters (a=11.013(2) Å,c=10.379(5) Å,V=1090.1(6) Å3) and refraction indices (ne=1.458(2),n o=1.498(2)) compare well with the best ones available in the literature. The IR spectrum and DT-TG profiles are given. Contradictions between the IR spectrum, a recent structural refinement and the DT-TG are discussed, but cannot be explained satisfactorily.
Zusammenfassung
Thaumasit aus der Mangan-Mine von Tschwinning, Süd-Afrika, besitzt die Formel Ca3.097 Si1.062OH6.372(CO3)0.994(SO4)1.000·11.596 H2O. Die Parameter der Elementarzelle (a=11.013(2) Å,c=10.379(5) Å,V=1090.1(6) Å3) und die Brechungsindizes (n e=1.458(2),n o=1.498(2)) zeigen gute Übereinstimmung mit verfügbaren Literaturdaten. Es werden ein IR-Spektrum und DT-TG-Profile präsentiert. Gegensätze zwischen dem IR-Spektrum, einer neueren Strukturverfeinerung und dem DT-TG werden diskutiert, können jedoch nicht zufriedenstellend erklärt werden.
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Grubessi, O., Mottana, A. & Paris, E. Thaumasite from the Tschwinning mine, South Africa. TMPM Tschermaks Petr. Mitt. 35, 149–156 (1986). https://doi.org/10.1007/BF01082082
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DOI: https://doi.org/10.1007/BF01082082