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Widenmannite, a rare uranyl lead carbonate; occurrence, formation and characterization

Jakub Plasil, J. Cejka, J. Sejkora, P. Skacha, V. Golias, P. Jarka, F. Laufek, J. Jehlicka, I. Nemec and L. Strnad
Widenmannite, a rare uranyl lead carbonate; occurrence, formation and characterization
Mineralogical Magazine (February 2010) 74 (1): 97-110


The rare uranyl lead carbonate widenmannite, Pb (sub 2) (UO (sub 2) )(CO (sub 3) ) (sub 3) , was found at the Janska vein, Pribram, Czech Republic, where two generations occur in several morphological types and mineral associations in hydrothermal veins. Alpha spectroscopy shows that these two generations have different ages, >220,000 and 118+ or -12 y. ICP-MS analysis indicates that both widenmannites have a dominance of non-radiogenic Pb which originates from weathered galena. The older widenmannite I forms fine-grained, grey to beige aggregates in the highly altered supergene part of the hydrothermal ore vein in association with pyromorphite, cerussite and goethite. The younger widenmannite II occurs as white, yellow or greenish-yellow thin tabular crystals up to 0.5 mm long in association with cerussite, anglesite, limonite, kasolite and an unnamed Pb-U-O phase. Thermal analysis suggests that widenmannite decomposes in several steps, with Pb uranate as the final product. Infrared and Raman spectroscopy confirm the presence of non-equivalent (CO (sub 3) ) (super 2-) groups, bidentately coordinated in uranyl hexagonal polyhedra, forming the well known uranyl tricarbonate complex. Infrared spectroscopy shows conclusively that widenmannite does not contain molecular H (sub 2) O.

ISSN: 0026-461X
EISSN: 1471-8022
Serial Title: Mineralogical Magazine
Serial Volume: 74
Serial Issue: 1
Title: Widenmannite, a rare uranyl lead carbonate; occurrence, formation and characterization
Affiliation: National Museum, Department of Mineralogy and Petrology, Prague, Czech Republic
Pages: 97-110
Published: 201002
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 43
Accession Number: 2010-050894
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
Secondary Affiliation: Charles University in Prague, CZE, Czech RepublicCzech Geological Survey, CZE, Czech Republic
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201028
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