1477

NanoSIMS Pb/Pb dating of tranquillityite in high-Ti lunar basalts: Implications for the chronology of high-Ti volcanism on the Moon
Romain Tartrtèse, Mahesh Anand, and Thomas Delhaye

1526

Ordering state in orthopyroxene as determined by precession electron diffraction
Damien Jacob, Lukas Palatinus, Priscille Cuvillier, Hugues Leroux, Chiara Domeneghetti, and Fernando Cámara

1550

Low-temperature magnetism of alabandite: Crucial role of surface oxidation
Jan Čuda, Tomáš Kohout, Jan Filip, Jiří Tuček, Andrei Kosterov, Jakub Haloda, Roman Skála, Eero Santala, Ivo Medřík, and Radek Zbořil

1557

Crystallographic and spectroscopic characterization of Fe-bearing chromo-alumino-povondraite and its relations with oxy-chromium-dravite and oxy-dravite
Ferdinando Bosi, Henrik Skogby, Ulf Hålenius, and Leonid Reznitskii

1585

A comparison of the Ca₃(PO₄)₂ and CaSiO₃ systems, with a new structure refinement of tuite synthesized at 15 GPa and 1300 °C
Richard M. Thompson, Xiande Xie, Shuangmeng Zhai, Robert T. Downs, and Hexiong Yang

1593

The system K₂CO₃-MgCO₃ at 6 GPa and 900–1450 °C
Anton Shatskiy, Igor S. Sharygin, Pavel N. Gavryushkin, Konstantin D. Litasov, Yuri M. Borzdov, Anastasia V. Shcherbakova, Yuji Higo, Ken-ichi Funakoshi, Yuri N. Palyanov, and Eiji Ohtani

1631

NEW MINERAL NAMES
Fernando Cámara, G. Diego Gatta, and Dorian G.W. Smith

1381

Further investigation of the initial fission-track length and geometry factor in apatite fission-track thermochronology
Cleber J. Soares, Sandro Guedes, Carlos A. Tello, Arnaldo L. Lixandrão Filho, Ana M. Osório, Igor Alencar, Airton N.C. Dias, and Julio Hadler

1377

Why you should publish your best papers in American Mineralogist: An International Journal of Earth and Planetary Materials
Keith Putirka

1379

New constraints on the size of chondrite parent bodies
Kevin Righter

1393

Carboniferous inherited grain and age zoning of monazite and xenotime from leucogranites in far-eastern Nepal: Constraints from electron probe microanalysis
Takeshi Imayama and Kazunori Suzuki

1407

Diffusion of helium in natural monazite, and preliminary results on He diffusion in synthetic light rare earth phosphates
Daniele J. Cherniak and E. Bruce Watson

1421

Crystal structure of the high-pressure phase of calcium hydroxide, portlandite: In situ powder and single-crystal X-ray diffraction study
Riko Iizuka, Takehiko Yagi, Kazuki Komatsu, Hirotada Gotou, Taku Tsuchiya, Keiji Kusaba, and Hiroyuki Kagi

1429

Experimental development of patch perthite from synthetic cryptoperthite: Microstructural evolution and chemical re-equilibration
Nicholas Norberg, Daniel Harlov, Gregor Neusser, Richard Wirth, Dieter Rhede, and Luiz Morales

1442

Oxy-dravite, Na(Al₂Mg)(Al₅Mg)(Si₆O₁₈)(BO₃)₃(OH)₃O, a new mineral species of the tourmaline supergroup
Ferdinando Bosi and Henrik Skogby

1449

Mechanical spectroscopy in twinned minerals: Simulation of resonance patterns at high frequencies
Ekhard K.H. Salje, Ziyuan Zhao, Xiangdong Ding, and Jun Sun

1459

Behavior of gold in a magma at sulfide-sulfate transition: Revisited
Roman E. Botcharnikov, Francois Holtz, James E. Mungall, Oliver Beermann, Robert L. Linnen, and Dieter Garbe-Sch??nberg

1465

A disordered nanoparticle model for 6-line ferrihydrite
Benjamin Gilbert, Jasmine J. Erbs, R. Lee Penn, Valeri Petkov, Dino Spagnoli, and Glenn A. Waychunas

1487

Iron sulfide stoichiometry as a monitor of sulfur fugacity in gas-mixing experiments
Astrid Holzheid and Katharina Lodders

1497

Relaxation effects and re-entrant spin glass behavior at low temperatures in natural strunzite, ferristrunzite, and ferrostrunzite
Antoine Van Alboom and Eddy De Grave

1508

Enthalpies of formation of Fe-Ni monosulfide solid solutions
Amir H. Tavakoli and Alexandra Navrotsky

1516

Influence of temperature and Cl on the hydrothermal replacement of calcite by apatite and the development of porous microstructures
Laura Jonas, Timm John, and Andrew Putnis

1535

Interlayer water molecules in organocation-exchanged vermiculite and montmorillonite: A case study of tetramethylammonium
Ruben Martos-Villa, Stephen Guggenheim, and C. Ignacio Sainz-D??az

1543

Spectroscopic and X-ray diffraction investigation of the behavior of hanksite and tychite at high pressures, and a model for the compressibility of sulfate minerals
Sarah E.M. Palaich, Craig E. Manning, Edwin Schauble, and Abby Kavner

1565

Experimental determination of siderite stability at high pressure
Renbiao Tao, Yingwei Fei, and Lifei Zhang

1573

Relationships among channel topology and atomic displacements in the structures of Pb₅(BO₄)₃Cl with B = P (pyromorphite), V (vanadinite), and As (mimetite)
Hiroki Okudera

1580

The crystal structure of johnbaumite, Ca₅(AsO₄)₃OH, the arsenate analogue of hydroxylapatite
Cristian Biagioni and Marco Pasero

1604

Influence of H₂ fluid on the stability and dissolution of Mg₂SiO₄forsterite under high pressure and high temperature
Ayako Shinozaki, Hisako Hirai, Hiroaki Ohfuji, Taku Okada, Shin-ichi Machida, and Takehiko Yagi

1610

Crystal chemistry of Cu-bearing tourmalines
Olga S. Vereshchagin, Ira V. Rozhdestvenskaya, Oleg V. Frank-Kamenetskaya, Anatoly A. Zolotarev, and Rudolf I. Mashkovtsev

1617

Lead-tellurium oxysalts from Otto Mountain near Baker, California: XI. Eckhardite, (Ca,Pb)Cu²⁺Te⁶⁺O₅(H₂O), a new mineral with HCP stair-step layers
Anthony R. Kampf, Stuart J. Mills, Robert M. Housley, George R. Rossman, Joseph Marty, and Brent Thorne

1624

Neutron diffraction in gemology: Single-crystal diffraction study of brazilianite, NaAl₃(PO₄)₂(OH)₄
G. Diego Gatta, Pietro Vignola, Martin Meven, and Romano Rinaldi