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Gamagarite: a re-examination and comparison with brackebuschite-like minerals

Harlow, George E. and Dunn, Pete J. and Rossman, George R. (1984) Gamagarite: a re-examination and comparison with brackebuschite-like minerals. American Mineralogist, 69 (7-8). pp. 803-806. ISSN 0003-004X.

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Gamagarite from Postmasburg district, Cape Province, Republic of South Africa, is reexamined using analytical chemical, infrared spectra, and X-ray diffraction techniques. The data indicate that gamagarite is isostructural with brackebuschite; space group is P2_1/m (assumed center of symmetry) with unit cell constants ɑ = 9.15(1), b = 6.17(1), c = 7.88(l)Å, β = 112.7(2)°. Infrared spectra indicate that strongly hydrogen-bonded OH^- is the dominant hydrogen-bearing species in both gamagarite and brackebuschite. Consequently, with a reevaluation of previously published structure data, our interpretation prefers the brackebuschite-type structure as a partially acid vanadate (arsenate and phosphate) containing HVO^(2-)_4 -type units rather than as a hydrated vanadate containing structural water, as previously described. However, there are uncertainties with the assignment of Mn oxidation state.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1984 Mineralogical Society of America. Manuscript received, May 21. 1982; accepted for publication, February 21. 1984. Discussions with Dr. Eric Dowty were helpful to G.E.H. Infrared studies were supported in part by NSF grant EAR 79-19987.
Funding AgencyGrant Number
NSFEAR 79-19987
Issue or Number:7-8
Record Number:CaltechAUTHORS:20130514-094423890
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Official Citation: George E. Harlow, Pete J. Dunn, and George R. Rossman Gamagarite; a re-examination and comparison with brackebuschite-like minerals American Mineralogist, August 1984, v. 69, p. 803-806
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38482
Deposited By: Ruth Sustaita
Deposited On:14 May 2013 16:57
Last Modified:26 Nov 2019 11:15

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