American Mineralogist, 2004, V 89, N 10, October.

 LETTERS 

 1557 
 Comparative planetary mineralogy: V/(Cr + Al) 
 systematics in chromite as an indicator of 
 relative oxygen fugacity 
 J.J. Papike, J.M. Karner, and C.K. Shearer 

 1561 
 Porous titanosilicate nanorods in the structure
 of yuksporite, (Sr,Ba)2K4(Ca,Na)14(Mn,Fe) 
 {(?,Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3} (H2O,OH)n,
 resolved using synchrotron radiation 
 Sergey V. Krivovichev, Viktor N. Yakovenchuk, 
 Thomas Armbruster, Nicola Dobelin, 
 Philipp Pattison, Hans-Peter Weber, 
 and Wulf Depmeier 

ARTICLES 

1353 
The origin of the color of pearls in iridescence
from nano-composite structures of the nacre 
Michael R. Snow, Allan Pring, Peter Self, 
Dusan Losic, and Joe Shapter 

1359 “Invisible” gold revealed: Direct imaging
of gold nanoparticles in a Carlin-type deposit 
Christopher S. Palenik, Satoshi Utsunomiya, 
Martin Reich, Stephen E. Kesler, Lumin Wang, 
and Rodney C. Ewing 

1367 
Behavior of cation vacancy in kenotetrahedral 
Cr-spinels from Albanian eastern belt ophiolites 
Ferdinando Bosi, Giovanni B. Andreozzi, 
Vincenzo Ferrini, and Sergio Lucchesi 

1374 
Displacement and strain fields around a [100] 
dislocation in olivine measured to sub-angstrom
accuracy 
Craig L. Johnson, Martin J. Hytch, and Peter R. Buseck 

1380 
Kiglapait mineralogy IV: The augite series 
S.A. Morse and Malcolm Ross 
   
1396 
Metasomatic formation of kosmochlor-bearing
diopside in peridotite xenoliths from North Island, 
New Zealand 
Kei Ikehata and Shoji Arai 
 
1405 
Determination of standard thermodynamic 
properties of sulfides in the Ag-Au-S system 
by means of a solid-state galvanic cell 
Evgeniy G. Osadchii and Olga A. Rappo 

1411 
Hydroxyl ordering in igneous apatite 
R. Chris Tacker 

1422 
Accommodation of the carbonate ion in apatite: 
An FTIR and X-ray structure study of crystals
synthesized at 2—4 GPa 
Michael E. Fleet, Xiaoyang Liu, and 
Penelope L. King 

1433 
Mg/Si ratios of aqueous fluids coexisting with 
forsterite and enstatite based on the phase 
relations in the Mg2SiO4-SiO2-H2O system 
Tatsuhiko Kawamoto, Kyoko N. Matsukage, 
Kenji Mibe, Maiko Isshiki, Koshi Nishimura, 
Naoki Ishimatsu, and Shigeaki Ono 

1438 
The activity of silica, water, and the 
equilibration of intermediate and silicic magmas 
Ian S.E. Carmichael 

1447 
The CO2—H2O system: IV. Empirical, isothermal
equations for representing vapor-liquid 
equilibria at 110—350 °C, P ? 150 MPa 
James G. Blencoe 

1456 
Repercussions of size heterogeneity on the
measurement of specific surface areas of colloidal
minerals: Combination of macroscopic and 
microscopic analyses 
Marie-Camille Jodin, Fabien Gaboriaud, 
and Bernard Humbert 

1464 
The crystal-structure of synthetic NaNa2Mg5Si8O21(OH)3,
a triclinic C1 amphibole with a triple-cell 
and excess hydrogen 
Fernando Camara, Roberta Oberti,
Giancarlo Della Ventura, Mark D. Welch, 
and Walter V. Maresch 

1474 
High-pressure phase transitions in 
Ca0.2Sr0.8Al2Si2O8 feldspar 
Fabrizio Nestola, Tiziana Boffa Ballaran, 
Piera Benna, Mario Tribaudino, 
and Emiliano Bruno 

1480 
Phase transition of Ca-perovskite and 
stability of Al-bearing Mg-perovskite
in the lower mantle 
Shigeaki Ono, Yasuo Ohishi, 
and Kenji Mibe 

1486 
Mineralogy and petrology of a mullite-bearing
pseudotachylyte: Constraints on the
temperature of coseismic frictional fusion 
David P. Moecher and Adrian J. Brearley 

1496
New developments in two-feldspar thermometry 
A. Benisek, H. Kroll, and L. Cemic 

1505 
Ordered distribution of Au and Ag in the crystal 
structure of muthmannite, AuAgTe2, a rare
telluride from Sacarimb, western Romania 
Luca Bindi and Curzio Cipriani 

1510
Polytypism of cookeite in low-grade metapelites
of the Cameros Basin, Spain: Lack of correlation
of well-ordered polytypes with pressure 
M. Pilar Mata, Donald R. Peacor, and
Francisco Lopez-Aguayo 

1516 
Evolution of mineral compositions during
eclogitization of subducting basaltic crust 
Juliette F. Forneris and John R. Holloway 

1525 
Mass balance during retrogression of 
eclogite-facies minerals in the Rongcheng 
eclogite, eastern Sulu ultrahigh-pressure terrane, 
China 
Tian N. Yang, Zhi Q. Xu, and Mary Leech 

1533 
Synthesis of REE and Y phosphates by Pb-free 
flux methods and their utilization as standards 
for electron microprobe analysis and in 
design of monazite chemical U-Th-Pb 
dating protocol 
D.J. Cherniak, J. Pyle, and John Rakovan 

1540 
The chemistry and crystal structure of 
okanoganite-(Y) and comparison with vicanite-(Ce) 
Massimo Boiocchi, Athos Callegari, 
Luisa Ottolini, and Adriana Maras 

1546 
An automated system for phase identification
and quantitative composition determination
using the electron microprobe: 
Theory and applications 
Kurt Steffen 

1553 
Piston-cylinder calibration at 400 to 500 MPa: 
A comparison of using water solubility in
albite melt and NaCl melting 
Don R. Baker 

1566 
New minerals approved in 2003 and 
nomenclature modifications approved in 
2003 by the Commission on New Minerals 
and Mineral Names, International
Mineralogical Association 
Ernst A.J. Burke (Chairman, CNMMN) 
and Giovanni Ferraris (Vice-Chairman, CNMMN) 

1574 
NEW MINERAL NAMES 
John L. Jambor, Edward J. Grew, A
nd Andrew C. Roberts 

1579 
ERRATUM 
Composition, Fe3+/?Fe, and crystal structure 
of non-asbestiform and asbestiform 
amphiboles from Libby, Montana, U.S.A. 
by M.E. Gunter, M.D. Dyar, B. Twamley, 
F.F. Foit Jr., and S. Cornelius 
(vol. 88, no. 11-12, pages 1970-1978, 2003). 

1580 
BOOK REVIEW 
The Petrographic Microscope. Daniel E. Kile (2003) 
Supplement to the Mineralogical Record, 
Publication Number One. 96 pp. 
The Mineralogical Record, Tucson, AZ. 
David Vaniman