American Mineralogist, 2006, V 91, N 8-9, August-September.

LETTERS
 
1448
Quantification of amphibole content in expanded
vermiculite products from Libby, Montana 
U.S.A. using powder X-ray diffraction 
Matthew S. Sanchez and Mickey E. Gunter 

ARTICLES
 
1211
Low-temperature Zr mobility: An in situ 
synchrotron-radiation XRF study of the 
effect of radiation damage in zircon on 
the element release in H2O + HCl ± SiO2 fluids 
Christian Schmidt, Karen Rickers, 
Richard Wirth, Lutz Nasdala, and John M. Hanchar 

1216
Magnetic properties, microstructure, 
composition, and morphology of greigite 
nanocrystals in magnetotactic bacteria 
from electron holography and tomography 
Takeshi Kasama, Mihaly Posfai, 
Ryan K.K. Chong, Anna P. Finlayson, 
Peter R. Buseck, Richard B. Frankel, 
and Rafal E. Dunin-Borkowski 

1230
Site preference and local geometry of 
Sc in garnets: Part I. Multifarious 
mechanisms in the pyrope-grossular join 
Roberta Oberti, Simona Quartieri, 
Maria Chiara Dalconi, Federico Boscherini, 
Gianluca Iezzi, Massimo Boiocchi, 
and Sigrid Griet Eeckhout 

1240
Site preference and local geometry of Sc 
in garnets: Part II. The crystal-chemistry 
of octahedral Sc in the andradite-Ca3Sc2Si3O12 join 
Simona Quartieri, Roberta Oberti, 
Massimo Boiocchi, Maria Chiara Dalconi, 
Federico Boscherini, Olga Safonova, 
and Alan B. Woodland 

1249
The arrojadite enigma: I. A new formula 
and a new model for the arrojadite structure 
Fernando Camara, Roberta Oberti, 
Christian Chopin, and Olaf Medenbach 

1260
The arrojadite enigma: II. Compositional 
space, new members, and nomenclature of the group 
Christian Chopin, Roberta Oberti, and Fernando Camara 

1271
Single-crystal X-ray diffraction and temperature 
dependent 57Fe Mossbauer spectroscopy on 
the hedenbergite-aegirine (
Ca,Na)(Fe2+,Fe3+)Si2O6 solid solution 
Gunther J. Redhammer, Georg Amthauer, 
Georg Roth, Gerold Tippelt, and 
Werner Lottermoser 

1293
Stacking structures in pyrophyllite revealed 
by high-resolution transmission electron 
microscopy (HRTEM) 
Toshihiro Kogure, Mayumi Jige, Jun Kameda, 
Akihiko Yamagishi, Ritsuro Miyawaki, 
and Ryuji Kitagawa 

1300
Intensity of quartz cathodoluminescence and 
trace-element content in quartz from the 
porphyry copper deposit at Butte, Montana 
Brian G. Rusk, Mark H. Reed, 
John H. Dilles, and Adam J.R. Kent 

1313
The fate of smectite in KOH solutions 
Andreas Bauer, Bruno Lanson, Eric Ferrage, 
Katja Emmerich, Heiner Taubald, 
Dieter Schild, and Bruce Velde 

1323
Light-induced changes in molecular arsenic 
sulfides: State of the art and new 
evidence by single-crystal X-ray diffraction 
Paola Bonazzi, Luca Bindi, 
Giovanni Pratesi, and Silvio Menchetti 

1331
Verifying and quantifying carbon fixation 
in minerals from serpentine-rich mine 
tailings using the Rietveld method 
with X-ray powder diffraction data 
Siobhan A. Wilson, Mati Raudsepp, 
and Gregory M. Dipple 

1342
Generation of pressures to ~60 GPa in 
Kawai-type apparatus and stability of 
MnGeO3 perovskite at high pressure 
and high temperature 
Daisuke Yamazaki, Toru Shinmei, Toru Inoue, 
Tetsuo Irifune, Akifumi Nozawa, 
and Kenichi Funakoshi 

1346
A model to predict phase equilibrium of 
CH4 and CO2 clathrate hydrate in aqueous 
electrolyte solutions 
Zhenhao Duan and Rui Sun 

1355
Raman investigation of H2O molecule and 
hydroxyl groups in the channels of hemimorphite 
Boris Kolesov 

1363
Stacking structure in disordered talc: 
Interpretation of its X-ray diffraction 
pattern by using pattern simulation and 
high-resolution transmission electron microscopy 
Toshihiro Kogure, Jun Kameda, 
Tomoyuki Matsui, and Ritsuro Miyawaki 

1371
Electrical conductivities of pyrope-almandine 
garnets up to 19 GPa and 1700 °C 
Claudia Romano, Brent T. Poe, Nadia Kreidie, 
and Catherine A. McCammon 

1378
Crystal chemistry and polytypism of tyrolite 
Sergey V. Krivovichev, Dmitrii Yu. Chernyshov, 
Nicola Dobelin, Thomas Armbruster, 
Volker Kahlenberg, Reinhard Kaindl, 
Giovanni Ferraris, Richard Tessadri, 
and Gerard Kaltenhauser 

1385
Effect of melt structure on trace-element 
partitioning between clinopyroxene and 
silicic, alkaline, aluminous melts 
F. Huang, C.C. Lundstrom, and W.F. McDonough 

1401
Analysis of light lithophile elements 
(Li, Be, B) by laser ablation ICP-MS: 
Comparison between magnetic sector 
and quadrupole ICP-MS 
Adam J.R. Kent and C.A. "Andy" Ungerer 

1412
Stornesite-(Y), (Y, Ca)?2Na6(Ca,Na)8(Mg,Fe)43(PO4)36, 
the first terrestrial Mg-dominant member of 
the fillowite group, from granulite-facies 
paragneiss in the Larsemann Hills, 
Prydz Bay, East Antarctica 
Edward S. Grew, Thomas Armbruster, 
Olaf Medenbach, Martin G. Yates, 
and Christopher J. Carson 

1425
Electron paramagnetic resonance spectroscopic
study of carbonate-bearing fluorapatite: 
New defect centers and constraints on the 
incorporation of carbonate ions in apatites 
Sergiy M. Nokhrin, Yuanming Pan, and Mark J. Nilges 

1432
EXAFS signature of structural Zn at trace 
levels in natural and synthetic 
trioctahedral 2:1 phyllosilicates 
Farid Juillot, Guillaume Morin, 
Philippe Ildefonse, Georges Calas, 
and Gordon E. Brown, Jr. 

1442
A neutron powder diffraction study of 
Fe and Ni distributions in synthetic 
pentlandite and violarite using 60Ni isotope 
Christophe Tenailleau, Barbara Etschmann, 
Richard M. Ibberson, and Allan Pring 

1452
NEW MINERAL NAMES 
Paula C. Piilonen, Ralph Rowe, 
T. Scott Ercit, and Andrew J. Locock 

1458
BOOK REVIEW 
David Vaniman 
UNEARTHING THE DRAGON: THE GREAT FEATHERED 
DINOSAUR DISCOVERY by Mark Norell. 
PI Press, New York 2005. 250 pp.