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Crystal chemistry of REEXO (sub 4) compounds (X = P, As, V); I, Paragenesis and crystal structure of phosphatian gasparite-(Ce) from the Kesebol Mn-Fe-Cu deposit, Vastra Gotaland, Sweden

Uwe Kolitsch, Dan Holtstam and Kjell Gatedal
Crystal chemistry of REEXO (sub 4) compounds (X = P, As, V); I, Paragenesis and crystal structure of phosphatian gasparite-(Ce) from the Kesebol Mn-Fe-Cu deposit, Vastra Gotaland, Sweden
European Journal of Mineralogy (February 2004) 16 (1): 111-116

Abstract

A new occurrence of the rare arsenate species gasparite-(Ce), ideally CeAsO (sub 4) , 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, Mn (super 2+) -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 (sub 0.77) La (sub 0.10) Nd (sub 0.10) Pr (sub 0.02) Ca (sub 0.01) Th (sub 0.007) [As (sub 0.84) P (sub 0.12) Si (sub 0.03) ]O (sub 4) and Ce (sub 0.79) La (sub 0.11) Nd (sub 0.11) Th (sub 0.010) [As (sub 0.85) P (sub 0.11) Si (sub 0.02) ]O (sub 4) . The Kesebol gasparite-(Ce) is distinguished from the type material by a higher Ce/REE (sub tot) ratio and a significant P content. The crystal structure of phosphatian gasparite-(Ce) has been determined from single-crystal X-ray diffractometer data (MoKalpha radiation, CCD area detector) and refined in space group P2 (sub 1) /n to R(F) = 2.86% for 776 "observed" reflections with F (sub o) >4sigma (F (sub o) ) (a = 6.929(3), b = 7.129(3), c = 6.697(3) Aa, beta = 104.46(3) degrees , V = 320.3(2) Aa (super 3) , Z = 4). The results confirm that gasparite-(Ce) has a monazite-type structure, and give the idealised formula (Ce,La,Nd)[(As (sub 0.71) P (sub 0.29) )O (sub 4) ].


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 16
Serial Issue: 1
Title: Crystal chemistry of REEXO (sub 4) compounds (X = P, As, V); I, Paragenesis and crystal structure of phosphatian gasparite-(Ce) from the Kesebol Mn-Fe-Cu deposit, Vastra Gotaland, Sweden
Affiliation: Universitaet Wien, Institut fuer Mineralogie und Kristallographie, Wien, Austria
Pages: 111-116
Published: 200402
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 40
Accession Number: 2004-038993
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N57°04'60" - N59°15'00", E10°45'00" - E14°40'00"
Secondary Affiliation: Swedish Museum of Natural History, SWE, SwedenMining Museum of Nordmark, SWE, Sweden
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200411
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