Electron absorption spectra have been measured in the 7,000-30,000 per cm region. The complex spectra of chlorite and biotite in the visible region show similarities to vivianite, known to contain Fe (super 2+) in octahedral sites. It is proposed that most of the features in the 15,000-30,000 per cm region of these spectra are due to spin-forbidden transitions of Fe (super 2+) . Spectra of all minerals show a double-band system due to spin-allowed transitions of octahedrally-bonded Fe (super 2+) . Splitting of bands is attributed to the dynamic Jahn-Teller mechanism. A relatively intense polarized band at 14,000 per cm, assigned to Fe (super 2+) Fe (super 3+) interaction, occurs in spectra of chlorite, biotite and some phlogopites. This, together with polarized high-energy charge transfer processes, is the cause of pleochroism in sections of these minerals perpendicular to the (001) cleavage.
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Research Article|
June 01, 1968
The optical absorption spectra of iron in six-coordinate sites in chlorite, biotite, phlogopite and vivianite; some aspects of pleochroism in the sheet silicates
G. H. Faye
Publisher: Mineralogical Association of Canada
First Online:
02 Mar 2017
Online ISSN: 1499-1276
Print ISSN: 0008-4476
© 1968 Mineralogical Association of Canada
Mineralogical Association of Canada
The Canadian Mineralogist (1968) 9 (3): 403–425.
Article history
First Online:
02 Mar 2017
Citation
G. H. Faye; The optical absorption spectra of iron in six-coordinate sites in chlorite, biotite, phlogopite and vivianite; some aspects of pleochroism in the sheet silicates. The Canadian Mineralogist 1968;; 9 (3): 403–425. doi:
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Index Terms/Descriptors
- absorption
- atomic absorption spectra
- biotite
- chlorite
- chlorite group
- crystal chemistry
- crystal structure
- iron
- major-element analyses
- metals
- mica group
- mineral data
- mineralogy
- phlogopite
- phosphates
- physical properties
- pleochroism
- properties
- sheet silicates
- silicates
- spectra
- spectroscopy
- vivianite
- Sheet
- iron position in lattice
- Chlorite-biotite-phlogopite-vivianite
- absorption spectra of iron
- iron position in lattices
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