1

Boron in natural type IIb blue diamonds: Chemical and spectroscopic measurements
Eloïse Gaillou, Jeffrey E. Post, Detlef Rost, and James E. Butler

19

Mejillonesite, a new acid sodium, magnesium phosphate mineral, from Mejillones, Antofagasta, Chile
Daniel Atencio, Nikita V. Chukanov, Fabrizio Nestola, Thomas Witzke, José M.V. Coutinho, Aleksandr E. Zadov, Reynaldo R. Contreira Filho, and Gunnar Färber

26

Silician magnetite from the Dales Gorge Member of the Brockman Iron Formation, Hamersley Group, Western Australia
Jason M. Huberty, Hiromi Konishi, Philipp R. Heck, John H. Fournelle, John W. Valley, and Huifang Xu

38

The mechanism of thermal decomposition of dolomite: New insights from 2D-XRD and TEM analyses
Carlos Rodriguez-Navarro, Krzysztof Kudlacz, and Encarnacion Ruiz-Agudo

52

A revised diamond-graphite transition curve
Howard W. Day

63

Insights into the crystal and aggregate structure of Fe³⁺ oxide/silica co-precipitates
Laurence G. Dyer, Karena W. Chapman, Phillip English, Martin Saunders, and William R. Richmond

70

Compositional dependence of alkali diffusivity in silicate melts: Mixed alkali effect and pseudo-alkali effect
Huaiwei Ni

80

Kinetics of evaporation of forsterite in vacuum
Kazuhito Ozawa, Hiroko Nagahara, Masana Morioka, Naoko Matsumoto, Ian D. Hutcheon, Takaaki Noguchi, and Hiroyuki Kagi

100

X-ray absorption near edge structure (XANES) study of the speciation of uranium and thorium in Al-rich CaSiO₃ perovskite
Steeve Gréaux, François Farges, Laurent Gautron, Nicolas Trcera, Anne-Marie Flank, and Pierre Lagarde

110

Rehydration of dehydrated-dehydroxylated smectite in a low water vapor environment
Arkadiusz Derkowski, Victor A. Drits, and Douglas K. McCarty

128

Effect of high pressure on the crystal structure and electronic properties of magnetite below 25 GPa
K. Glazyrin, C. McCammon, L. Dubrovinsky, M. Merlini, K. Schollenbruch, A. Woodland, and M. Hanfland

134

OH group behavior and pressure-induced amorphization of antigorite examined under high pressure and temperature using synchrotron infrared spectroscopy
Naoki Noguchi, Taro Moriwaki, Yuka Ikemoto, and Keiji Shinoda

143

Single-crystal Raman spectroscopy of natural paulmooreite Pb₂As₂O₅ in comparison with the synthesized analog
Silmarilly Bahfenne, Llew Rintoul, J??rgen Langhof, and Ray L. Frost

150

The dissolution of laumontite in acidic aqueous solutions: A controlled-temperature in situ atomic force microscopy study
Marco Voltolini, Gilberto Artioli, and Massimo Moret

159

Crystal structure of CaRhO₃ polymorph: High-pressure intermediate phase between perovskite and post-perovskite
Y. Shirako, H. Kojitani, A.R. Oganov, K. Fujino, H. Miura, D. Mori, Y. Inaguma, K. Yamaura, and M. Akaogi

164

Oxide melt solution calorimetry of Fe²⁺-bearing oxides and application to the magnetite–maghemite (Fe₃O₄–Fe_8/3O₄) system
Kristina I. Lilova, Fen Xu, Kevin M. Rosso, Carolyn I. Pearce, Saeed Kamali, and Alexandra Navrotsky

176

Static compression of (Mg_0.83,Fe_0.17)O and (Mg_0.75,Fe_0.25)O ferropericlase up to 58 GPa at 300, 700, and 1100 K
Masanori Matsui, Eiji Ito, Daisuke Yamazaki, Takashi Yoshino, Xinzhuan Guo, Shuangming Shan, Yuji Higo, and Ken-Ichi Funakoshi

184

Implications of ferrous and ferric iron in antigorite
Bernard W. Evans, M. Darby Dyar, and Scott M. Kuehner

197

Markascherite, Cu₃(MoO₄)(OH)₄, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A.
H. Yang, R.A. Jenkins, R.M. Thompson, R.T. Downs, S.H. Evans, and E.M. Bloch

203

Natural hydrous amorphous silica: Quantitation of network speciation and hydroxyl content by ²⁹Si MAS NMR and vibrational spectroscopy
Steven M. Chemtob, George R. Rossman, and Jonathan F. Stebbins

212

Lead-tellurium oxysalts from Otto Mountain near Baker, California: VII. Chromschieffelinite, Pb₁₀Te₆O₂₀(OH)₁₄(CrO₄)(H₂O)₅, the chromate analog of schieffelinite
Anthony R. Kampf, Stuart J. Mills, Robert M. Housley, Michael S. Rumsey, and John Spratt

220

Experimental growth of diopside + merwinite reaction rims: The effect of water on microstructure development
Bastian Joachim, Emmanuel Gardés, Boza Velickov, Rainer Abart, and Wilhelm Heinrich

231

Menchettiite, AgPb_2.40Mn_1.60Sb₃As₂S₁₂, a new sulfosalt belonging to the lillianite series from the Uchucchacua polymetallic deposit, Lima Department, Peru
R. Abart, E. Petrishcheva, and B. Joachim

241

The high-pressure behavior of micas: Vibrational spectra of muscovite, biotite, and phlogopite to 30 GPa
Quentin Williams, Elise Knittle, Henry P. Scott, and Zhenxian Liu

253

Critical evaluation of the revised akdalaite model for ferrihydrite—Discussion
Vidal Barrón, José Torrent, and F. Marc Michel

255

Critical evaluation of the revised akdalaite model for ferrihydrite—Reply
Alain Manceau

19

Mejillonesite, a new acid sodium, magnesium phosphate mineral, from Mejillones, Antofagasta, Chile
Daniel Atencio, Nikita V. Chukanov, Fabrizio Nestola, Thomas Witzke, José M.V. Coutinho, Aleksandr E. Zadov, Reynaldo R. Contreira Filho, and Gunnar Färber

26

Silician magnetite from the Dales Gorge Member of the Brockman Iron Formation, Hamersley Group, Western Australia
Jason M. Huberty, Hiromi Konishi, Philipp R. Heck, John H. Fournelle, John W. Valley, and Huifang Xu

52

A revised diamond-graphite transition curve
Howard W. Day

159

Crystal structure of CaRhO₃ polymorph: High-pressure intermediate phase between perovskite and post-perovskite
Y. Shirako, H. Kojitani, A.R. Oganov, K. Fujino, H. Miura, D. Mori, Y. Inaguma, K. Yamaura, and M. Akaogi

184

Implications of ferrous and ferric iron in antigorite
Bernard W. Evans, M. Darby Dyar, and Scott M. Kuehner

203

Natural hydrous amorphous silica: Quantitation of network speciation and hydroxyl content by ²⁹Si MAS NMR and vibrational spectroscopy
Steven M. Chemtob, George R. Rossman, and Jonathan F. Stebbins