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GEOREF RECORD

Uranopolycrase, the uranium-dominant analogue of polycrase-(Y), a new mineral from Elba Island, Italy, and its crystal structure

Carlo Aurisicchio, Paolo Orlandi, Marco Pasero and Natale Perchiazzi
Uranopolycrase, the uranium-dominant analogue of polycrase-(Y), a new mineral from Elba Island, Italy, and its crystal structure
European Journal of Mineralogy (December 1993) 5 (6): 1161-1165

Abstract

Uranopolycrase was found in the 'Fonte del Prete' pegmatitic vein, near S. Piero in Campo village, Elba, associated with euxenite- (Y), manganocolumbite, polycrase-(Y), titanowodginite and uranmicrolite. It forms tabular 100 crystals, elongated on [001], and is opaque, wth a brown-red colour and adamantine lustre; mean VHN (sub 20) 659; in reflected light it is pale grey with bluish tones, reflectance approx 24%. Indexed XRD powder data are tabulated; strongest lines 2.99(100), 1.90(50), 1.48(40), 1.77(35), 2.78(25) Angstrom ; a 14.51, b 5.558, c 5.173 Angstrom ; space group Pbcn. EPMA results led to a formula (U (sub 0.62) Y (sub 0.29) Th (sub 0.07) Nd (sub 0.01) Ca (sub 0.02) Mn (sub 0.03) ) (sub SIGMA 1.04) - (Ti (sub 1.46) Nb (sub 0.36) Ta (sub 0.12) ) (sub SIGMA 1.94) O (sub 6) or ideally (U,Y)(Ti,Nb,Ta) (sub 2) O (sub 6) . The crystal structure has been refined to R 0.047; the relationships with other compounds with the same structural topology are discussed.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 5
Serial Issue: 6
Title: Uranopolycrase, the uranium-dominant analogue of polycrase-(Y), a new mineral from Elba Island, Italy, and its crystal structure
Affiliation: C.N.R., Centro di Studio per gli Equilibiri Sperimentali in Minerali e Rocce, Rome, Italy
Pages: 1161-1165
Published: 199312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 9
Accession Number: 1994-001551
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 4 tables
N42°19'60" - N44°19'60", E09°40'00" - E12°25'00"
Secondary Affiliation: Universita di Pisa, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199401
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