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

Geiger, Charles A. and Stahl, Andreas and Rossman, George R. (1999) Raspberry-red grossular from Sierra de Cruces Range, Coahuila, Mexico. European Journal of Mineralogy, 11 (6). pp. 1109-1113. ISSN 0935-1221.

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A raspberry-red grossular from the Sierra de Cruces Range in the state of Coahuila in Mexico has been investigated. Electron-microprobe analysis and ^(57)Fe Mòssbauer and UVYVIS spectroscopy were used in order to investigate the nature of the unusual red colour. The composition of the garnet is approximately (Ca_(2.94)Mg_(0.09)Mn^(2+)_(0.10))_(3.13)(Al_(1.90)Fe^(3+) _(0.05)Mn^(3+)_(0.01))_(1.96)Si_(2.97)O_(12). The UV/VIS spectrum is characterised by an absorption envelope centred around 19,000 cm1 in the green region, which can be fitted with two bands located at 19,503 and 17,302 cm^(-1), originating from two spin-allowed dd-electron transitions. They result from the presence of Mn^(3+) on the octahedral site of point symmetry 3.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1999 E. Schweizerbart'sche Verlagsbuchhandlung. Received 4 December 1998. Modified version received 6 May 1999. Accepted 18 May 1999. Work at Caltech was supported under a grant from the White Rose Foundation.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
White Rose FoundationUNSPECIFIED
Subject Keywords:colour in minerals, garnet, UV/VIS spectroscopy, Mössbauer spectroscopy
Issue or Number:6
Record Number:CaltechAUTHORS:20130502-094830657
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Official Citation: Charles A. Geiger, Andreas Stahl, and George R. Rossman Raspberry-red grossular from Sierra de Cruces Range, Coahuila, Mexico Eur J Mineral, December 1999, v. 11, p. 1109-1113
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38231
Deposited By: Ruth Sustaita
Deposited On:02 May 2013 17:10
Last Modified:03 Oct 2019 04:55

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