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

Author(s)

Uwe Kolitsch, D Holtstam, Kjell Gatedal

Abstract

A new occurrence of the rare arsenate species gasparite-(Ce), ideally CeAsO₄,

is reported from the Kesebol Mn-Fe-Cu deposit in southwestern 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: _0.010[As_0.85P_0.11Si_0.02]O₄. The Kesebol gasparite-(Ce) is distinguished from the type material by a higher Ce/REE₁₀₁

ratio and a significant P content. The crystal structure of phosphatian

gasparite-(Ce) has been determined from single-crystal X-ray

diffractometer data (Mo Kα radiation, CCD area detector) and refined in

space group P2₁In to R(F) - 2.86 % for 776 'observed' reflections with F₀ > 4σ(F_o) (α = 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]. © 2004 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart.

Organisation(s)

Department of Mineralogy and Crystallography

External organisation(s)

Swedish Museum of Natural History, Nordmark Mining Museum

Journal

European Journal of Mineralogy: an international journal of mineralogy, geochemistry and related sciences

Volume

16

Pages

111-116

No. of pages

6

ISSN

0935-1221

Publication date

2004

Peer reviewed

Yes

Austrian Fields of Science 2012

1051 Geology, Mineralogy

Portal url

https://ucrisportal.univie.ac.at/en/publications/0c10436a-92c8-436b-aa88-6ec78394f6a2