|  | LETTERS
 
| 497 | A method for controlling alkali-metal oxide activities in one-atmosphere experiments and its application to measuring the relative activity coefficients of NaO0.5 in silicate melts Hugh St. C. O'Neill
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| 506 | Microscopic strain in synthetic pyrope-grossular solid solutions determined by synchrotron X-ray powder diffraction at 5 K: The relationship to enthalpy of mixing behavior Monica Dapiaggi, Charles A. Geiger, and Gilberto Artioli
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| 510 | Ferrous hydroxy carbonate is a stable transformation product of biogenic magnetite Ravi K. Kukkadapu, John M. Zachara, James K. Fredrickson, David W. Kennedy, Alice C. Dohnalkova, and David E. McCready
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 |  REVIEW ARTICLE
 
| 277 | Comparative planetary mineralogy: Valence state partitioning of Cr, Fe, Ti, and V among crystallographic sites in olivine, pyroxene, and spinel from planetary basalts J.J. Papike, J.M. Karner, and C.K. Shearer
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 |  ARTICLES
 
| 291 | The origin of orthopyroxene/biotite + plagioclase coronas from the Bolangir anorthosite complex (India), and implications for reconstructing P-T paths Sonika Prasad, A. Bhattacharya, M.M. Raith, and S. Bhadra
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| 304 | Dellaventuraite, NaNa2(MgMn3+2Ti4+Li)Si8O22O2, a new anhydrous amphibole from the Kajlidongri Manganese Mine, Jhabua District, Madhya Pradesh, India Kimberly T. Tait, Frank C. Hawthorne, Joel D. Grice, Luisa Ottolini, and V.K. Nayak
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| 329 | Thermochemistry of hydrotalcite-like phases in the MgO-Al2O3-CO2-H2O system: A determination of enthalpy, entropy, and free energy Rama kumar Allada, Alexandra Navrotsky, and Juliana Boerio-Goates
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| 347 | Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation Olivier Vidal, Teddy Parra, and Philippe Vieillard
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