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A Spectrographic Interpretation of the Shock-Produced Color Change in Rhodonite (MnSiO_3): The Shock-Induced Reduction of Mn(lll) to Mn(II).

Gibbons, Rex V. and Ahrens, Thomas J. and Rossman, George R. (1974) A Spectrographic Interpretation of the Shock-Produced Color Change in Rhodonite (MnSiO_3): The Shock-Induced Reduction of Mn(lll) to Mn(II). American Mineralogist, 59 (1-2). pp. 177-182. ISSN 0003-004X.

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Samples of rhodonite (MnSiO_3-pyroxenoid from Franklin, New Jersey) have been shockloaded to pressures up to 496 kilobars. Optical spectral studies of four recovered samples show a decreasing Mn^(3+) content upon recovery from successively higher shock pressures; after shock-loading to 496 kbar, the Mn^(3+) has essentially disappeared. No corresponding change in the optical spectrum results from heating rhodonite to 1250°C for 3.5 hours in a reducing atmosphere. Rhodonite heated to 1360° under the same conditions melts incongruently to manganese-rich glass and silica with disappearance of the 540 nm Mn^(3+) absorption band. The color change in the shocked rhodonite arises from irreversible reduction of Mn3+ during high shock pressures and possible high shock temperatures. It is suggested that Mn^(3+) is reduced to Mn^(2+) by water present in the sample during the shock event.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1974 Mineralogical Society of America. Manuscript received, June 15, 1973; accepted for publication, September 12, 1973. Dave Cole did the high temperature experiments; we appreciate his assistance. We thank Jo Laird for critically reading the manuscript and acknowledge helpful discussions of the work with Ed Gaffney. We thank Elmer Steffensen, Charles Hudson, and Richard Wickes for their careful construction of the target assemblies. This work was sponsored under DA-ARO-D-31-124-72-G64 (Army Research Office) and GA 21396 (National Science Foundation).
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
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Army Research Office (ARO)DA-ARO-D-31-124-72-G64
NSFGA 21396
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Caltech Division of Geological and Planetary Sciences2337
Issue or Number:1-2
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Official Citation:A spectrographic interpretation of the shock-produced color change in rhodonite (MnSiO3): The shock-induced reduction of Mn(III) to Mn(II) Rex V. Gibbons, Thomas J. Ahrens, and George R. Rossman 177-182
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38440
Deposited By: Ruth Sustaita
Deposited On:13 May 2013 16:53
Last Modified:03 Oct 2019 04:57

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