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European Journal of Mineralogy; May, June 2003; v. 15; no. 3; p. 555-564; DOI: 10.1127/0935-1221/2003/0015-0555
© 2003 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Sailaufite, (Ca, Na, {square})2Mn3O2(AsO4)2(CO3)·3H2O, a new mineral from Hartkoppe hill, Ober-Sailauf (Spessart mountains, Germany), and its relationship to mitridatite-group minerals and pararobertsite

Manfred WILDNER1,*, Ekkehart TILLMANNS1, Michael ANDRUT1 and Joachim LORENZ2

1 Institut für Mineralogie und Kristallographie der Universität Wien, Geozentrum, Althanstr. 14, A-1090 Wien, Austria
2 Graslitzer Str. 5, D-63791 Karlstein/Main, Germany

* Corresponding author, e-mail: manfred.wildner{at}univie.ac.at

Dedicated to the memory of Luciano Ungaretti

Sailaufite, a new mineral with idealized composition CaNaMn3+3O2(AsO4)2(CO3).3H2O, has been found at the locality Hartkoppe hill near Ober-Sailauf (Spessart mountains, Germany), associated with hausmannite, arseniosiderite, kutnahorite, dolomite, quartz, calcite, and Mn-calcite. It occurs as strongly intergrown, dark red-brown to black tabular crystals, often forming mammillated coatings on calcite and arseniosiderite. Mohs' hardness is ~3.5, the cleavage is perfect parallel (001), the tenacity is brittle with an uneven to conchoidal fracture. Crystals are optically biaxial negative, at 616 nm n{alpha} = 1.757(5), {delta}ß,{gamma} = 0.004(1), 2V = 32(3)°, nß(calc) = 1.806, n{gamma}(calc) = 1.810. The strongest lines in the X-ray powder diffraction pattern are (dobs, I, hkl): 8.807, 100, 001; 5.654, 27, 130; 5.544, 17, 200; 2.936; 75, 003; 2.885, 19, 331; 2.816, 20, 332; 2.772, 36, 400; 2.514, 20, 133; 2.202, 55, 004. UV-VIS-IR spectroscopic measurements confirm the presence of AsO4 and CO3 groups as well as the absence of transition metal ions other than Mn3+ in sailaufite. The crystal structure of a small untwinned crystal fragment could be solved by direct methods from X-ray CCD data [monoclinic, space group Cm, a = 11.253(1), b = 19.628(1), c = 8.932(1) Å, ß = 100.05(1)°, Z = 6] and was refined on 8650 F2o to wR2 = 0.079 and R1 = 0.045. The structure contains characteristic nonamer rings of edge-sharing Mn3+O6 octahedra forming compact pseudotrigonal [Mn3+9O6(AsO4)6(CO3)3]9– sheets which are linked by layers composed of (Ca,Na,{square})O5(H2O)2 polyhedra and isolated water molecules. The octahedral nonamer rings correspond to those occuring in the Fe3+-phosphate mitridatite and bear strong similarities to the arrangement of Z-shaped octahedral chains in the Mn3+-phosphate pararobertsite.

Key-words: sailaufite, new mineral, crystal structure, arsenate, carbonate.




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