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Crystal chemistry of REEXO₄ compounds (X = P, As, V). I. Paragenesis and crystal structure of phosphatian gasparite-(Ce) from the Kesebol Mn-Fe-Cu deposit, Västra Götaland, Sweden

¹ Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstr. 14, A-1090 Wien, Austria
² Department Mineralogy, Research Division, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden
³ Mining Museum of Nordmark, SE-682 93 Nordmarkshyttan, Sweden

^* Corresponding author, e-mail: uwe.kolitsch{at}univie.ac.at

A new occurrence of the rare arsenate species gasparite-(Ce), ideally CeAsO₄, is reported from the Kesebol Mn-Fe-Cu deposit in south-western Sweden, where it occurs as yellowish euhedral crystals up to 0.5 mm in maximum size, in association with rhodonite, andradite, Mn²⁺-dominant "allanite-(Ce)", chernovite-(Y), manganoan calcite and quartz. All gasparite samples studied are phosphatian, and quantitative SEM-EDS analyses of two representative grains gave the following average compositions: Ce_0.77La_0.10Nd_0.10Pr_0.02Ca_0.01Th_0.007[As_0.84P_0.12Si_0.03]O₄ and Ce_0.79La_0.11Nd_0.11Th_0.010[As_0.85P_0.11Si_0.02]O₄. The Kesebol gasparite-(Ce) is distinguished from the type material by a higher Ce/REE_tot ratio and a significant P content.

The crystal structure of phosphatian gasparite-(Ce) has been determined from single-crystal X-ray diffractometer data (Mo Ka radiation, CCD area detector) and refined in space group P2_1/n to R(F) = 2.86 % for 776 ‘observed’ reflections with F_o > 4(F_o) (a = 6.929(3), b = 7.129(3), c = 6.697(3) Å, β = 104.46(3)°, V = 320.3(2) ų, Z = 4). The results confirm that gasparite-(Ce) has a monazite-type structure, and give the idealised formula (Ce, La, Nd)[(As_0.71P_0.29)O₄].

Key-words: gasparite-(Ce), occurrence, Kesebol, crystal structure, monazite.

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