BaMn[CO3]2 – a previously unrecognized double carbonate in low-temperature environments

Michael E. Böttcher, Herta S. Effenberger, Peer-Lennart Gehlken, Georg H. Grathoff, Burkhard C. Schmidt, Patrizia Geprägs, Rainer Bahlo, Olaf Dellwig, Thomas Leipe, Vera Winde, André Deutschmann, Alexander Stark, David Gallego-Torres, Francisca Martinez-Ruiz (2012): BaMn[CO3]2 – a previously unrecognized double carbonate in low-temperature environments: Structural, spectroscopic, and textural tools for future identification Chemie der Erde - Geochemistry, 72, 85-89.

Following a tentative evidence for the occurrence of low-temperature barium manganese(II) carbonates in brackish sediments of the Baltic Sea, a stoichiometric double carbonate, BaMn[CO3]2, was synthesized from aqueous solutions at ambient temperature for the first time. Here we report the results of a multi-method approach, including scanning electron microscopy (SEM–EDX) investigations, the chemical composition, and, in particular, the diagnostic powder X-ray diffraction pattern, as well as diagnostic parts of the FT infrared absorption and Raman spectra for future identification of this new carbonate in low-temperature environments, like brackish sediments.

Added.

EDIT: According to this paper and the conference contribution
[meetingorganizer.copernicus.org]
the mineral was also reported from a metamorphic environment (Hirowatari & Fukuoka, 1988).



Edited 1 time(s). Last edit at 05/30/2012 04:05PM by Uwe Kolitsch.