1804

A natural photoelectrochemical cell for water splitting: Implications for early Earth and Mars
Carrick M. Eggleston, Justin R. Stern, Tess M. Strellis, and Bruce A. Parkinson

1808

In situ observation of the breakdown of magnetite (Fe₃O₄) to Fe₄O₅ and hematite at high pressures and temperatures
Alan B. Woodland, Daniel J. Frost, Dmytro M. Trots, Kevin Klimm, and Mohamed Mezouar

1812

The crystal structure of bartelkeite, with a revised chemical formula, PbFeGe^VI(Ge^IV₂O₇)(OH)₂·H₂O, isotypic with high-pressure P2₁/m lawsonite
Marcus J. Origlieri, Hexiong Yang, Robert T. Downs, Esther S. Posner, Kenneth J. Domanik, and William W. Pinch

1533

Mineralogy, petrology, U-Pb geochronology, and geologic evolution of the Dabie-Sulu classic ultrahigh-pressure metamorphic terrane, East-Central China
Juhn G. Liou, Ruyuan Zhang, Fulai Liu, Zeming Zhang, and W. Gary Ernst

1544

Brittle-ductile microfabrics in naturally deformed zircon: Deformation mechanisms and consequences for U-Pb dating
Sandra Piazolo, HÃ¥kon Austrheim, and Martin Whitehouse

1564

In situ hot-stage AFM study of the dissolution of the barite (001) surface in water at 30–55 °C
Yoshihiro Kuwahara

1574

A multi-domain gem-grade Brazilian apatite
Tom Baikie, Martin K. Schreyer, Chui Ling Wong, Stevin S. Pramana, Wim T. Klooster, Cristiano Ferraris, Garry J. McIntyre, and T.J. White

1582

High-temperature structural behaviors of anhydrous wadsleyite and forsterite
Dmytro M. Trots, Alexander Kurnosov, Tiziana Boffa Ballaran, and Daniel J. Frost

1591

Synthetic B-rich olenite: Correlations of single-crystal structural data
Andreas Ertl, Gerald Giester, Thomas Ludwig, Hans-Peter Meyer, and George R. Rossman

1598

Rates and mechanism of Y, REE, and Cr diffusion in garnet
William D. Carlson

1619

EPR discrimination of microcrystalline calcite geomaterials
Francesco Di Benedetto, Antonella Buccianti, Giordano Montegrossi, Massimo Innocenti, Carlo Andrea Massa, Luca A. Pardi, and Maurizio Romanelli

1627

Crystal chemistry of Bi- and Mn-bearing vesuvianite from LÃ¥ngban, Sweden
Lee A. Groat and R. James Evans

1635

Cation ordering in Pb²⁺-bearing, Mn³⁺-rich pargasite from LÃ¥ngban, Sweden
Ulf HÃ¥lenius and Ferdinando Bosi

1641

Long-term solid-phase fate of co-precipitated U(VI)-Fe(III) following biological iron reduction by Thermoanaerobacter
Andrew S. Madden, Andrew L. Swindle, Melanie J. Beazley, Ji-Won Moon, Bruce Ravel, and Tommy J. Phelps

1653

The sulfur speciation in S-bearing minerals: New constraints by a combination of electron microprobe analysis and DFT calculations with special reference to sodalite-group minerals
Kai Hettmann, Thomas Wenzel, Michael Marks, and Gregor Markl

1662

Semi-quantitative determination of the Fe/Mg ratio in synthetic cordierite using Raman spectroscopy
Udo Haefeker, Reinhard Kaindl, and Peter Tropper

1670

Simultaneous sound velocity and density measurements of NaCl at high temperatures and pressures: Application as a primary pressure standard
Masanori Matsui, Yuji Higo, Yoshihiro Okamoto, Tetsuo Irifune, and Ken-Ichi Funakoshi

1676

The temperature and compositional dependence of disordering in Fe-bearing dolomites
Ettore Franzolin, Marco Merlini, Stefano Poli, and Max W. Schmidt

1685

Quantifying crystallization and devitrification of rhyolites by means of X-ray diffraction and electron microprobe analysis
Michael C. Rowe, Ben S. Ellis, and Abbie Lindeberg

1700

Reactions of strontium anorthite with H₂O+CaCl₂ fluids at 500 °C and high pressure: Kinetic information from in situ synchrotron-radiation XRF analyses of the fluid
Christian Schmidt, Richard Wirth, Max Wilke, Maria Mrosko, and Karen Appel

1708

Solubility of xenotime in a 2 M HCl aqueous fluid from 1.2 to 2.6 GPa and 300 to 500 °C
Elizabeth A. Tanis, Adam Simon, Oliver Tschauner, Paul Chow, Yuming Xiao, Gouyin Shen, John M. Hanchar, and Mark Frank

1714

Elastic and anelastic anomalies due to spin-state transitions in orthorhombic perovskite from isoelectronic behavior of Co³⁺ and Fe²⁺
Zhiying Zhang, Johannes Koppensteiner, Wilfried Schranz, and Michael A. Carpenter

1726

Accurate determination of ferric iron in garnets by bulk M??ssbauer spectroscopy and synchrotron micro-XANES
M. Darby Dyar, Elly A. Breves, Erica Emerson, Samuel W. Bell, Melissa Nelms, Marie V. Ozanne, Samantha E. Peel, Marco L. Carmosino, Jonathan M. Tucker, Mickey E. Gunter, Jeremy S. Delaney, Antonio Lanzirotti, and Alan B. Woodland

1741

Re-investigation of the crystal structure of enstatite under high-pressure conditions
Benedetta Periotto, Tonci Balić-Žunić, Fabrizio Nestola, Anna Katerinopoulou, and Ross J. Angel

1749

Second-order P6c2-P31c transition and structural crystallography of the cyclosilicate benitoite, BaTiSi₃O₉, at high pressure
Clivia Hejny, Ronald Miletich, Andreas Jasser, Pascal Schouwink, Wilson Crichton, and Volker Kahlenberg

1764

High-pressure structural studies of eskolaite by means of single-crystal X-ray diffraction
Anastasia Kantor, Innokenty Kantor, Marco Merlini, Konstantin Glazyrin, Clemens Prescher, Michael Hanfland, and Leonid Dubrovinsky

1771

Almandine: Lattice and non-lattice heat capacity behavior and standard thermodynamic properties
Edgar Dachs, Charles A. Geiger, and Artur Benisek

1783

Witzkeite: A new rare nitrate-sulphate mineral from a guano deposit at Punta de Lobos, Chile
Fabrizio Nestola, Fernando Cámara, Nikita V. Chukanov, Daniel Atencio, José M.V. Coutinho, Reynaldo R. Contreira Filho, and Gunnar Färber

1788

Krasheninnikovite, KNa₂CaMg(SO₄)₃F, a new mineral from the Tolbachik volcano, Kamchatka, Russia
Igor V. Pekov, Michael E. Zelenski, Natalia V. Zubkova, Dmitry A. Ksenofontov, Yuriy K. Kabalov, Nikita V. Chukanov, Vasiliy O. Yapaskurt, Aleksandr E. Zadov, and Dmitry Y. Pushcharovsky

1796

Crystal structure of pseudojohannite, with a revised formula, Cu₃(OH)₂[(UO₂)₄O₄(SO₄)₂](H₂O)₁₂
Jakub Plášil, Karla Fejfjfarová, Kia Sheree Wallwork, Michal Dušek, Radek Škoda, Jiří Sejkora, Jiří Čejka, František Veselovský, Jan Hloušek, Nicolas Meisser, and Joël Brugger

1816

Presentation of the Dana Medal of the Mineralogical Society of America for 2012 to Roberta L. Rudnick
Albrecht Hofmann

1817

Acceptance of the Dana Medal of the Mineralogical Society of America for 2012
Roberta L. Rudnick

1818

New Mineral Names
Dmitry Belakovskiy, and Kimberly T. Tait

1574

A multi-domain gem-grade Brazilian apatite
Tom Baikie, Martin K. Schreyer, Chui Ling Wong, Stevin S. Pramana, Wim T. Klooster, Cristiano Ferraris, Garry J. McIntyre, and T.J. White

1582

High-temperature structural behaviors of anhydrous wadsleyite and forsterite
Dmytro M. Trots, Alexander Kurnosov, Tiziana Boffa Ballaran, and Daniel J. Frost

1627

Crystal chemistry of Bi- and Mn-bearing vesuvianite from LÃ¥ngban, Sweden
Lee A. Groat and R. James Evans

1635

Cation ordering in Pb²⁺-bearing, Mn³⁺-rich pargasite from LÃ¥ngban, Sweden
Ulf HÃ¥lenius and Ferdinando Bosi

1641

Long-term solid-phase fate of co-precipitated U(VI)-Fe(III) following biological iron reduction by Thermoanaerobacter
Andrew S. Madden, Andrew L. Swindle, Melanie J. Beazley, Ji-Won Moon, Bruce Ravel, and Tommy J. Phelps

1676

The temperature and compositional dependence of disordering in Fe-bearing dolomites
Ettore Franzolin, Marco Merlini, Stefano Poli, and Max W. Schmidt

1685

Quantifying crystallization and devitrification of rhyolites by means of X-ray diffraction and electron microprobe analysis
Michael C. Rowe, Ben S. Ellis, and Abbie Lindeberg

1700

Reactions of strontium anorthite with H₂O+CaCl₂ fluids at 500 °C and high pressure: Kinetic information from in situ synchrotron-radiation XRF analyses of the fluid
Christian Schmidt, Richard Wirth, Max Wilke, Maria Mrosko, and Karen Appel

1741

Re-investigation of the crystal structure of enstatite under high-pressure conditions
Benedetta Periotto, Tonci Balić-Žunić, Fabrizio Nestola, Anna Katerinopoulou, and Ross J. Angel

1749

Second-order P6c2-P31c transition and structural crystallography of the cyclosilicate benitoite, BaTiSi₃O₉, at high pressure
Clivia Hejny, Ronald Miletich, Andreas Jasser, Pascal Schouwink, Wilson Crichton, and Volker Kahlenberg

1771

Almandine: Lattice and non-lattice heat capacity behavior and standard thermodynamic properties
Edgar Dachs, Charles A. Geiger, and Artur Benisek

1783

Witzkeite: A new rare nitrate-sulphate mineral from a guano deposit at Punta de Lobos, Chile
Fabrizio Nestola, Fernando Cámara, Nikita V. Chukanov, Daniel Atencio, José M.V. Coutinho, Reynaldo R. Contreira Filho, and Gunnar Färber

1796

Crystal structure of pseudojohannite, with a revised formula, Cu₃(OH)₂[(UO₂)₄O₄(SO₄)₂](H₂O)₁₂
Jakub Plášil, Karla Fejfjfarová, Kia Sheree Wallwork, Michal Dušek, Radek Škoda, Jiří Sejkora, Jiří Čejka, František Veselovský, Jan Hloušek, Nicolas Meisser, and Joël Brugger

1808

In situ observation of the breakdown of magnetite (Fe₃O₄) to Fe₄O₅ and hematite at high pressures and temperatures
Alan B. Woodland, Daniel J. Frost, Dmytro M. Trots, Kevin Klimm, and Mohamed Mezouar

1812

The crystal structure of bartelkeite, with a revised chemical formula, PbFeGe^VI(Ge^IV₂O₇)(OH)₂·H₂O, isotypic with high-pressure P2₁/m lawsonite
Marcus J. Origlieri, Hexiong Yang, Robert T. Downs, Esther S. Posner, Kenneth J. Domanik, and William W. Pinch

1818

New Mineral Names
Dmitry Belakovskiy, and Kimberly T. Tait