Polarized absorption spectra of sellaite from the Brumado mine, Brazil, in the near infrared
Polarized absorption spectra of sellaite from the Brumado mine, Brazil, were recorded in the region v = 1600‒4000 cm-1 (λ = 6.25‒2.50 μm). Besides weak, non-pleochroic broad bands in the range of the H2O bending and stretching vibrations ‒ evidently caused by liquid inclusions ‒ a sharp pleochroic b...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Geological Society of Finland
1985-12-01
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| Series: | Bulletin of the Geological Society of Finland |
| Subjects: | |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume57/sgs_bt_057_pages_113_118.pdf |
| Summary: | Polarized absorption spectra of sellaite from the Brumado mine, Brazil, were recorded in the region v = 1600‒4000 cm-1 (λ = 6.25‒2.50 μm). Besides weak, non-pleochroic broad bands in the range of the H2O bending and stretching vibrations ‒ evidently caused by liquid inclusions ‒ a sharp pleochroic band was observed at v = 3615 cm-1 . For this band the absorption is much stronger when the electric vector vibrates perpendicular to [001]; it is tentatively interpreted by a minor substitution of fluorine by hydroxyl groups.
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| ISSN: | 0367-5211 1799-4632 |