1556

LETTER: Fivefold-coordinated aluminum in tectosilicate glasses observed by triple quantum MAS NMR
Michael J. Toplis, Simon C. Kohn, Mark E. Smith, and Iain J.F. Poplett

1329

Nucleation and growth kinetics of analcime from precursor Na-clinoptilolite
R.T. Wilkin and H.L. Barnes

1342

Viscosities of granitic (sensu lato) melts: Influence of the anorthite component
D.B. Dingwell, K.-U. Hess, and C. Romano

1349

Geochemistry of pyroxene inclusions from the Warrumbungle Volcano, New South Wales, Australia
Mohammad R. Ghorbani and Eric A.K. Middlemost

1368

Supersilicic clinopyroxene and silica exsolution in UHPM eclogite and pelitic gneiss from the Kokchetav massif, Kazakhstan
Ikuo Katayama, Christopher D. Parkinson, Kazuaki Okamoto, Youichi Nakajima, and Shigenori Maruyama

1375

Experimental study of intracrystalline Fe²⁺-Mg exchange in three augite crystals: Effect of composition on geothermometric calibration
Elisabetta Brizi, Gianmario Molin, and Pier Francesco Zanazzi

1383

Transmission electron microscopy and differential thermal studies of lazurite polymorphs
Ishmael Hassan

1390

Re-equilibration of glass and CO₂ inclusions in xenolith olivine: A TEM study
Cecilia Viti and Maria-Luce Frezzotti

1397

Origin and structural character of haüyne_ss in spinel dunite
Erik Wulff-Pedersen, Else-Ragnhild Neumann, Ernst A.J. Burke, Riccardo Vannucci, Piero Bottazzi, Luisa Ottolini, Jon Gjønnes, and Vidar Hansen

1406

Pyrrhotite varieties from the 9.1 km deep borehole of the KTB project
Mihály Pósfai, Thomas G. Sharp, and Agnes Kontny

1416

Mineralogy and magnetic behavior of pyrrhotite from a 260 °C section at the KTB drilling site, Germany
Agnes Kontny, Helga de Wall, Thomas G. Sharp, and Mihály Pósfai

1428

Surface defects and self-diffusion on pyrite {100}: An ultra-high vacuum scanning tunneling microscopy and theoretical modeling study
Kevin M. Rosso, Udo Becker, and Michael F. Hochella Jr.

1437

Rare-earth elements in chlorapatite [Ca₁₀(PO₄)₆Cl₂]: Uptake, site preference, and degradation of monoclinic structure
Michael E. Fleet, Xiaoyang Liu, and Yuanming Pan

1447

Thermal pressure in MgO and MgSiO₃ perovskite at lower mantle conditions
Bijaya B. Karki

1452

Electron energy-loss spectroscopy of silicate perovskite-magnesiowüstite high-pressure assemblages
Alexandre Gloter, François Guyot, Isabelle Martinez, and Christian Colliex

1459

Magnesium coordination environments in glasses and minerals: New insight from high-field magnesium-25 MAS NMR
Scott Kroeker and Jonathan F. Stebbins

1465

In situ powder diffraction study of titanite (CaTiOSiO₄) at high pressure and high temperature
Martin Kunz, Thilo Arlt, and Jano Stolz

1474

Surinamite: A high-temperature metamorphic beryllosilicate from Lewisian sapphirine-bearing kyanite-orthopyroxene-quartz-potassium feldspar gneiss at South Harris, N.W. Scotland
Sotaro Baba, Edward S. Grew, Charles K. Shearer, and John W. Sheraton

1485

Single-crystal X-ray diffraction study of FeGeO₃ high-P clinopyroxene (C2/c) up to 8.2 GPa
T. Hattori, T. Nagai, T. Yamanaka S. Werner, and H. Schulz

1492

High-pressure Ca₄Al₆O₁₃: An example of a calcium aluminate with three different types of coordination polyhedra for aluminum
Volker Kahlenberg, Reinhard X. Fischer, and Cliff S.J. Shaw

1497

Cation distribution in synthetic zinc ferrite (Zn_0.97Fe_2.02O₄) from in situ high-temperature neutron powder diffraction
Alessandro Pavese, Davide Levy, and Andreas Hoser

1503

Infrared study of OH sites in tourmaline from the elbaite-schorl series
Cristiane Castañeda, Ester Figueiredo Oliveira, Newton Gomes, and Antônio Carlos Pedrosa Soares

1508

Second occurrence of okayamalite, Ca₂SiB₂O₇: chemical and TEM characterization
F. Olmi, C. Viti, L. Bindi, P. Bonazzi, and S. Menchetti

1512

Rietveld refinement of okayamalite, Ca₂SiB₂O₇: Structural evidence for the B/Si ordered distribution
G. Giuli, L. Bindi, and P. Bonazzi

1516

Tumchaite Na₂(Zr,Sn)Si₄O₁₁·2H₂O A new mineral from carbonatites of the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia
Victor V. Subbotin, Stefano Merlino, Dmitry Yu. Pushcharovsky, Yakov A. Pakhomovsky, Orazio Ferro, Alla N. Bogdanova, Anatoly V. Voloshin, Natalia V. Sorokhtina, and Natalia V. Zubkova

1521

The crystal structure of thornasite, Na₁₂Th₃[Si₈O₁₉]₄(H₂O)₁₈: A novel interrupted silicate framework
Yaping Li, Sergey V. Krivovichev, and Peter C. Burns

1526

Symesite, Pb₁₀(SO₄)O₇Cl₄(H₂O), a new PbO-related sheet mineral: Description and crystal structure
Mark D. Welch, Mark A. Cooper, Frank C. Hawthorne, and Alan J. Criddle

1534

Na₂Ca₂(P₂O₇)F₂, the first diphosphate of the cuspidine family
A. Piotrowski, V. Kahlenberg, and R.X. Fischer

1540

Amphibole asbestos from Libby, Montana: Aspects of nomenclature
Ann G. Wylie and Jennifer R. Verkouteren

1543

COMMENT: Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)₂SiO₄ and (Ca,Mg,Fe)₂SiO₄ olivines
Michael E. Fleet

1548

REPLY: Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)₂SiO4 and (Ca,Mg,Fe)₂SiO₄ olivine
Marc M. Hirschmann

1561

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

1566

MEMORIAL: Memorial of Eugene N. Cameron, 1910-1999
Philip E. Brown

1569

MEMORIAL: Memorial of Louis S. Walter, 1933-2000
F. Donald Bloss

1570

BOOK REVIEW: Glossary of Mineral Synonyms. By Jeffrey de Fourestier
Carl Francis

1570

BOOK REVIEW: Langban: The Mines, Their Minerals, Geology, and Explorers. Edited by Dan Holtstam and Jurgen Langhof
Paulus B. Moore

1565

ERRATUM: Variability of apatite fission-track annealing kinetics: II. Crystallographic orientation effects
Raymond A. Donelick, Richard A. Ketcham, and William D. Carlson

1375

Experimental study of intracrystalline Fe²⁺-Mg exchange in three augite crystals: Effect of composition on geothermometric calibration
Elisabetta Brizi, Gianmario Molin, and Pier Francesco Zanazzi

1437

Rare-earth elements in chlorapatite [Ca₁₀(PO₄)₆Cl₂]: Uptake, site preference, and degradation of monoclinic structure
Michael E. Fleet, Xiaoyang Liu, and Yuanming Pan

1521

The crystal structure of thornasite, Na₁₂Th₃[Si₈O₁₉]₄(H₂O)₁₈: A novel interrupted silicate framework
Yaping Li, Sergey V. Krivovichev, and Peter C. Burns

1526

Symesite, Pb₁₀(SO₄)O₇Cl₄(H₂O), a new PbO-related sheet mineral: Description and crystal structure
Mark D. Welch, Mark A. Cooper, Frank C. Hawthorne, and Alan J. Criddle