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Joaquinite: The Nature of its Water Content and the Question of Four-Coordinated Ferrous Iron

Rossman, George R. (1975) Joaquinite: The Nature of its Water Content and the Question of Four-Coordinated Ferrous Iron. American Mineralogist, 60 (5-6). pp. 435-440. ISSN 0003-004X.

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The polarized optical and infrared spectra of oriented crystals of joaquinite from San Benito County, California, have been obtained. The infrared spectra have polarized absorption bands at 3561, 3500, and 1607 cm^(-1), which are assigned to the vibrations of crystallographically ordered molecular water in joaquinite. The optical spectra show features due to neodymimum and divalent iron. The near infrared absorptions near 1000 and 2100 nm are discussed in terms of six-coordinated iron(II) rather than the four-coordinated iron(II) proposed from X-ray structural studies.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1975 Mineralogical Society of America. Manuscript received September 20, 1974: accepted for publication, January 14, 1975. Mr. Buzz Gray, of the Dalles Gem Mine, provided most of the joaquinite specimens used in this study. Professor Fiorenzo Mazzi provided additional structural data regarding the iron site from his X-ray structure determination, and Jo Laird supplied information regarding her X-ray studies and chemical analyses and kindly reviewed the manuscript.
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Caltech Division of Geological and Planetary Sciences2465
Issue or Number:5-6
Record Number:CaltechAUTHORS:20130507-113852531
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38326
Deposited By: John Wade
Deposited On:07 May 2013 20:57
Last Modified:26 Nov 2019 11:15

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