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Raspberry-red grossular from Sierra de Cruces Range, Coahuila, Mexico

Charles A. Geiger, Andreas Stahl and George R. Rossman
Raspberry-red grossular from Sierra de Cruces Range, Coahuila, Mexico
European Journal of Mineralogy (December 1999) 11 (6): 1109-1113


A raspberry-red grossular from the Sierra de Cruces Range in the state of Coahuila in Mexico has been investigated. Electron-microprobe analysis and (super 57) Fe Mossbauer and UV/VIS spectroscopy were used in order to investigate the nature of the unusual red colour. The composition of the garnet is approximately (Ca (sub 2.94) Mg (sub 0.09) Mn (super 2+) (sub 0.10) ) (sub 3.13) (Al (sub 1.90) Fe (super 3+) (sub 0.05) Mn (super 3+) (sub 0.01) ) (sub 1.96) Si (sub 2.97) O (sub 12) . The UV/VIS spectrum is characterised by an absorption envelope centred around 19,000 cm (super -1) in the green region, which can be fitted with two bands located at 19,503 and 17,302 cm (super -1) , originating from two spin-allowed dd-electron transitions. They result from the presence of Mn (super 3+) on the octahedral site of point symmetry 3.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 6
Title: Raspberry-red grossular from Sierra de Cruces Range, Coahuila, Mexico
Affiliation: Christian-Albrechts-Universitaet zu Kiel, Institut fuer Geowissenschaften, Kiel, Federal Republic of Germany
Pages: 1109-1113
Published: 199912
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 9
Accession Number: 2000-026842
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N24°30'00" - N29°49'60", W104°00'00" - W100°00'00"
Secondary Affiliation: Calfornia Institute of Technology, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200009
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