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American Mineralogist; August 1997; v. 82; no. 7-8; p. 812-819
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A hydrous Ca-bearing magnesium carbonate from playa lake sediments, Salines Lake, Spain

Ignasi Queralt, Ramon Julia, Feliciano Plana, and James L. Bischoff

Institute of Earth Sciences "Jaume Almera" (CSIC), Barcelona, Spain

Sediments of playa Lake Salines, SE, Spain, contain a carbonate mineral characterized by X-ray diffraction peaks very similar to, but systematically shifted from those of pure magnesite. Analyses (SEM, IR and Raman spectroscopy, DTA, TGA, and ICP) indicate the mineral is a hydrous Ca-bearing magnesium carbonate with the chemical formula (Mg (sub 0.92) , Ca (sub 0.08) )CO 3 .3H 2 O. Thermal characteristics of the mineral are similar to those of other known hydrated magnesium carbonates. X-ray and electron diffraction data suggests a monoclinic system (P21/n space group) with unit-cell parameters of a = 6.063(6), b = 10.668(5), and c = 6.014(4) Aa and beta = 107.28 degrees .

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