American Mineralogist, 2001, V 86, N 10, October.

LETTERS 

1302
Pristine surface growth features on 100 Ma garnet phenocrysts: Interference 
imaging results 
Thomas H. Pearce 

1307
Oxygen triclusters in crystalline CaAl4O7 (grossite) and in calcium 
aluminosilicate glasses: 17O NMR 
J.F. Stebbins, J.V. Oglesby, and S. Kroeker 

1312
Low-temperature heat capacity of pentlandite 
Gleb A. Berezovskii, Valeri A. Drebushchak, and Tatyana A. Kravchenko 

1314
Calcium segregation at antiphase boundaries in pigeonite 
Kevin T. Moore, David R. Veblen, and James M. Howe 

ARTICLES 

1117
Recalibration of the GASP geobarometer in light of recent garnet and plagioclase 
activity models and versions of the garnet-biotite geothermometer 
M.J. Holdaway 

1130
Compositional zoning and element partitioning in nickeloan tourmaline from a 
metamorphosed karstbauxite from Samos, Greece 
Darrell J. Henry and Barbara L. Dutrow 

1143
Occurrence of apatite associated with magnetite in an ophiolite complex
(Othrys), Greece 
Ioannis Mitsis and Maria Economou-Eliopoulos 

1151
Overpressures induced by coesite-quartz transition in zircon 
Kai Ye, Jing-Bo Liou, Bolin Cong, and Shigenori Maruyama 

1156
Geochemical modeling of bacterially induced mineralization of schwertmannite and 
jarosite in sulfuric acid spring water 
Motoharu Kawano and Katsutoshi Tomita 

1166
H2O-D2O exchange in Lawsonite 
Stefan Marion, Hinrich-Wilhelm Meyer, Michael Carpenter, and Truls Norby 

1170
Composition and temperature dependence of cation ordering in Ni-Mg olivine solid 
solutions: a time-of-flight neutron powder diffraction and EXAFS study 
C. Michael B. Henderson, Simon A.T. Redfern, Ronald I. Smith, Kevin S. Knight, 
and John M. Charnock 

1188
Thermal conductivity of spinels and olivines from vibrational spectroscopy: 
Ambient conditions 
A.M. Hofmeister 

1209
Elasticity of six polycrystalline silicate garnets at pressure up to 3.0 GPa 
Zichao Wang and Shaocheng Ji 

1219
The crystal chemistry of birefringent natural uvarovites: Part I. Optical 
investigations and UV-VIS-IR absorption spectroscopy 
Michael Andrut and Manfred Wildner 

1231
The crystal chemistry of birefringent natural uvarovites: Part II. Single-
crystal X-ray structures 
Manfred Wildner and Michael Andrut 

1252
Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy 
study 
Krassimir N. Bozhilov and Bernard W. Evans 

1261
Crystal structure of a new (21)-clinopyribole synthesized at high temperature 
and pressure 
Hexiong Yang, Jurgen Konzett, and Charles T. Prewitt 

1267
The Mg(Fe)SiO3 orthoenstatite-clinoenstatite transitions at high pressures and 
temperatures determined by Raman-spectroscopy on quenched samples 
Peter Ulmer and Roland Stalder 

1275
Raman spectroscopic studies of phase E to 19 GPa 
Annette K. Kleppe, Andrew P. Jephcoat, and Nancy L. Ross 

1282
The crystal structures of the low-temperature phases of leonite-type compounds, 
K2Me(SO4)2·4H2O(Me2+ = Mg, Mn, Fe) 
Birgit Hertweck, Gerald Giester, and Eugen Libowitzky 

1293
Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries: 
their chemical compositions, physical properties, and structural features 
Stefano Merlino and Paolo Orlandi 

1319
BOOK REVIEW 
Stephen T. Nelson 
The Diamond Makers by Robert M. Hazen, Cambridge University Press, 1999. 

1320
MEMORIAL 
E.H. Nickel 
Memorial of James Graham, 1929-2001