Orschallite, Ca3(SO3)2 · SO4 · 12H2O, a new calcium-sulfite-sulfate-hydrate mineral (original) (raw)

Summary

The new mineral orschallite, Ca3(SO3)2SO4 · 12H2O, was found at the Hannebacher Ley near Hannebach, Eifel, Germany. Crystal structure analysis of the mineral, chemical analysis and water determination on synthetic material gave the composition Ca3(SO3)2SO4 · 12H2O. The mineral crystallizes in space group\(R\bar 3c\) with a = 11.350(1), c = 28.321(2) Å, V = 3159.7 Å3, Z = 6, Dc = 1.87 Mg/m3, Dm = 1.90(3) Mg/m3. It is uniaxial positive with the optical constants_ω_ = 1.4941,ɛ = 1.4960(4). The strongest lines in the powder pattern are (d-value (Å), I, hkl) 5.73, 100, 1 0 4/8.11, 80, 0 1 2/2.69, 80, 3 0 6/3.63, 60, 1 1 6/3.28, 40, 3 0 0. Refinement of the crystal structure led to a weighted residual of Rw = 0.043 for 600 observed reflections with I > 2σ(I) and 52 variable parameters.

Zusammenfassung

Das neue Mineral Orschallit, Ca3(SO3)2SO4 · 12H2O, wurde in der Hannebacher Ley bei Hannebach, Eifel, Deutschland gefunden. Eine Analyse der Kristallstruktur an einem Einkristall des natürlichen Materials, chemische Analyse und Wasserbestimmung an synthetischem Material ergaben die Zusammensetzung Ca3(SO3)2SO4 · 12H2O. Das Mineral kristallisiert in der Raumgruppe\(R\bar 3c\) mit a = 11.350(1), c = 28.321(2) Å, V = 3159.7 Å3, Z = 6, Dc = 1.87 Mg/m3, Dm = 1.90(3) Mg/m3. Es ist optisch einachsig mit den optischen Konstanten_ω_ = 1.4941,ɛ = 1.4960(4). Die stärksten Linien des Pulver-diagramms liegen bei (d-Wert (Å), I, hkl) 5.73, 100, 1 0 4/8.11, 80, 0 1 2/2.69, 80, 3 0 6/3.63, 60; 1 1 6/3.28, 40, 3 0 0. Die Verfeinerung der Kristallstruktur ergab einen gewichteten Residualwert Rw = 0.043 für 600 beobachtete Reflexe mit I > 2σ(I) und 52 variable Parameter.

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Authors and Affiliations

1. Institut für Geowissenschaften, Johannes Gutenberg Universität, Saarstrasse 21, D-55122, Mainz, Germany
   C. Weidenthaler
2. Institut für Mineralogie und Kristallographie der Universität, Dr. Karl, Lueger-Ring 1, A-1010, Wien, Austria
   E. Tillmanns
3. Schillerstrasse 1, D-53489, Sinzig, Germany
   G. Hentschel

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1. C. Weidenthaler
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2. E. Tillmanns
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3. G. Hentschel
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Weidenthaler, C., Tillmanns, E. & Hentschel, G. Orschallite, Ca3(SO3)2 · SO4 · 12H2O, a new calcium-sulfite-sulfate-hydrate mineral.Mineralogy and Petrology 48, 167–177 (1993). https://doi.org/10.1007/BF01163095

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• Received: 10 July 1992
• Accepted: 07 November 1992
• Issue Date: June 1993
• DOI: https://doi.org/10.1007/BF01163095

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