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The optical spectroscopic comparison of the ferric iron tetrameric clusters in amarantite and leucophosphite

Rossman, George R. (1976) The optical spectroscopic comparison of the ferric iron tetrameric clusters in amarantite and leucophosphite. American Mineralogist, 61 (9-10). pp. 933-938. ISSN 0003-004X. https://resolver.caltech.edu/CaltechAUTHORS:20130513-104749141

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Abstract

Optical absorption spectra and magnetic susceptibility data are presented for two minerals amarantite, Fe_2(SO_4)_2O·7H_2O, and leucophosphite, K_2[Fe_4(OH)_2(H2O)_2(PO_4)_4]·2H_2O, which contam nearly planar ferric iron tetrameric units. These data are compared to corresponding single crystal optical data for phosphosiderite, FePO_4•.2H_2O. Pronounced enhancement of the intensities of the absorption bands and absorption anisotropy, which are associated with the strong antiferromagnetic coupling (µ_(Fe) = 2.53 B.M. at 297°K) of the oxobridged amarantite tetramer, is noted for amarantite. Synthetic leucophosphite exhibits a much weaker antiferro-magnetic interaction (µ_(Fe) = 5.13 B.M.). Natural leucophosphite displays little optical absorption anisotropy and much lower absorption intensity than amarantite.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://www.minsocam.org/msa/collectors_corner/amtoc/toc1976.htmPublisherUNSPECIFIED
ORCID:
AuthorORCID
Rossman, George R.0000-0002-4571-6884
Additional Information:© 1976 Mineralogical Society of America. Manuscript received, August 15, 1975; accepted for publication, February 25, 1976. Professor Paul B. Moore of the University of Chicago furnished the leucophosphite crystals from the Tip Top pegmatite. The amarantite was obtained from the National Museum of Natural History, Smithsonian Institution.
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences2512
Issue or Number:9-10
Record Number:CaltechAUTHORS:20130513-104749141
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130513-104749141
Official Citation:The optical spectroscopic comparison of the ferric iron tetrameric clusters in amarantite and leucophosphite George R. Rossman 933-938, 1976
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38445
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 May 2013 18:05
Last Modified:26 Nov 2019 11:15

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