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Why hematite is red: Correlation of optical absorption intensities and magnetic moments of Fe^(3+) minerals

Rossman, George R. (1996) Why hematite is red: Correlation of optical absorption intensities and magnetic moments of Fe^(3+) minerals. In: Mineral spectroscopy: a tribute to Roger G. Burns. Special publication (Geochemical Society). No.5. Geochemical Society , Houston, TX, pp. 23-27. ISBN 9780941809047.

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Structures with Fe^(3+) shared through oxo- or hydroxyl-groups have antiferromagnetic interactions. Such interactions result in enhanced intensity of the Fe^(3+) optical absorption bands which in some systems can be as great as a factor of 100 compared to isolated, octahedrally coordinated Fe^(3+) ions. A comparison is presented between the intensity of the lowest energy crystal-field band of Fe^(3+) minerals and their magnetic moments which demonstrates the dependence of optical absorption intensity and antiferromagnetic interactions in the host phase. Hematite, which is usually responsible for the red color of geological materials, owes its intense color to these magnetic interactions.

Item Type:Book Section
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1996 Geochemical Society. Support for optical spectroscopy of minerals has been provided by the White Rose Foundation and the National Science Foundation (USA). Contribution number 5624 of the Division of Geological and Planetary Sciences.
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White Rose FoundationUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences5624
Series Name:Special publication (Geochemical Society)
Issue or Number:5
Record Number:CaltechAUTHORS:20130710-111534961
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39285
Deposited By: Tony Diaz
Deposited On:16 Jul 2013 21:33
Last Modified:03 Oct 2019 05:05

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