American Mineralogist, 2005, V 90, N 2-3, Feb-March.

 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 

502
Very low solubility of rutile in H2O at high
pressure and temperature, and its
implications for Ti-mobility in subduction zones 
Peter Tropper and Craig E. Manning 

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 

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 

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 

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 

 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 

 310 
 Successive zoning of Al and H in
 hydrothermal vein quartz 
 Naoya Miyoshi, Yoshiaki Yamaguchi, 
 and Kuniaki Makino 

 316 
 The Ti-saturation surface for low-to-medium 
 pressure metapelitic biotites: Implications 
 for geothermometry and Ti-substitution mechanisms 
 Darrell J. Henry, Charles V. Guidotti, 
 and Jennifer A. Thomson 

 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 

 336
 Igneous thermometers and barometers 
 based on plagioclase + liquid equilibria:
 Tests of some existing models and new calibrations 
 Keith D. Putirka 

 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 

359 
Experimental data on the Tschermak 
substitution in Fe-chlorite 
Teddy Parra, Olivier Vidal, and Thomas Theye 
 
371 
Nanometer-sized, divalent-Mn, hydrous silicate
domains in geothermal brine precipitates 
Alain Manceau and Darrell L. Gallup 
 
382 
Geometric crystal chemical models for structural
analysis of micas and their stacking polytypes 
Patrick H.J. Mercier, R. James Evans, 
and Denis G. Rancourt 

399 
Fundamental difference between synthetic
powder and natural or synthetic single-crystal 
1M micas: Geometric homo-octahedral vs. 
geometric meso-octahedral sheets 
Patrick H.J. Mercier, Denis G. Rancourt, 
Jean-Louis Robert, Rob G. Berman, 
and Guenther J. Redhammer 

411 
The crystal structures of synthetic Fe2(SO4)3(H2O)5
and the type specimen of lausenite 
Juraj Majzlan, Cristian Botez, and Peter W. Stephens 

417 
Experimental study of plagioclase rim growth
around anorthite seed crystals in rhyodacitic melt 
Jessica F. Larsen 

428 
Luminescence study of defects in synthetic 
as-grown and HPHT diamonds compared
to natural diamonds 
Joachim Lindblom, Jorma Holsa, 
Heikki Papunen, and Heikki Hakkanen 

441 
Molar absorptivities of OH and H2O in
rhyolitic glass at room temperature 
and at 400-600 °C 
Satoshi Okumura and Satoru Nakashima 

448
Ordering and elasticity associated with 
low-temperature phase transitions in lawsonite 
P. Sondergeld, W. Schranz, A. Troster, 
T. Armbruster, G. Giester, A. Kityk, 
and M.A. Carpenter 

457 
Formation of metastable cubic-perovskite
in high-pressure phase transformation 
of Ca(Mg, Fe, Al)Si2O6 
Yuki Asahara, Eiji Ohtani, Tadashi Kondo, 
Tomoaki Kubo, Nobuyoshi Miyajima, 
Toshiro Nagase, Kiyoshi Fujino,
Takehiko Yagi, and Takumi Kikegawa 

463
Oxygen isotope heterogeneities and diffusion
profile in composite metamorphic-magmatic
garnets from the Pyrenees 
Daniel Vielzeuf, Michele Veschambre, 
and Fabrice Brunet 

473 
Unmixed spinel in chromitite from 
the Iwanai-dake peridotite complex,
Hokkaido, Japan: A reaction between
peridotite and highly oxidized magma
in the mantle wedge 
Akihiro Tamura and Shoji Arai 

481 
Mn-bearing "oxy-rossmanite" with 
tetrahedrally coordinated Al and B from 
Austria: Structure, chemistry, and infrared
and optical spectroscopic study 
Andreas Ertl, George R. Rossman, 
John M. Hughes, Stefan Prowatke, 
and Thomas Ludwig 

488 
Geochemical applications of the simple
salt approximation to the lattice energies
of complex materials 
Claude H. Yoder and Natalie J. Flora 

516
"Named Amphiboles": A new category of 
amphiboles recognized by the International 
Mineralogical Association (IMA) and a 
defined sequence order for the use of 
prefixes in amphibole names 
Ernst A.J. Burke and Bernard E. Leake 

518 
NEW MINERAL NAMES 
John L. Jambor, Edward S. Grew,
and Andrew C. Roberts 

523 
REVIEWERS 2004