AMERICAN MINERALOGIST, 1999, V 84, N 9, September.

ARTICLES
William D. Carlson, Raymond A. Donelick, and Richard A. Ketcham 
Variability of apatite  fission-track annealing kinetics: 
I. Experimental results 
1213 

Raymond A. Donelick, Richard A. Ketcham, and  William D. Carlson 
Variability of apatite fission-track annealing kinetics:
II. Crystallographic orientation effects 
1224 

Peter I. Nabelek 
Trace element distribution among rock-forming minerals in
Black Hills migmatites, South  Dakota:  A case for solid-state
equilibrium 
1256 

Antonio Sanchez-Navas 
Sequential kinetics of a muscovite-out reaction: A
natural example 
1270 

David P. Moecher and  Zachary D. Sharp 
Comparison of conventional and garnet-aluminosilicate-quartz O
isotope thermometry: Insights for mineral equilibration in
metamorphic rocks 
1287 

Anurag Sharma and David M. Jenkins 
Hydrothermal synthesis of amphiboles along the tremolitepargasite join and in
the ternary system tremolitepargasitecummingtonite
1304 

L.Y. Aranovich and R.C. Newton 
Experimental determination of CO2-H2O activity-composition
relations at 600?1000 C and 6?14 kbar by reversed
decarbonation and dehydration reactions 
1319

J?rgen Truckenbrodt and Wilhelm Johannes 
H2O loss during piston-cylinder experiments
1333


B.O. Mysen, F. Holtz, M. Pichavant, J.-M. Beny, and J.-M. Montel
The effect of temperature and bulk composition on the solution mechanism of
phosphorus in peraluminous haplogranitic magma 
1336  

Delores M. Robinson and Calvin F. Miller 
Record of magma chamber processes preserved in accessory mineral
assemblages, Aztec Wash pluton, Nevada 
1346

Christine Floss 
Fe,Mg,Mn-bearing phosphates in the GRA95209 meteorite:
Occurrences and mineral chemistry 
1354 

Hongwu Xu, Peter J. Heaney, Alexandra Navrotsky, Letitia Topor, and Jun Liu 
Thermochemistry of stuffed quartz-derivative phases along the join
LiAlSiO4-SiO2 
1360 

Mark S. Ghiorso, Hexiong Yang, and  Robert M. Hazen 
Thermodynamics of cation ordering in karrooite (MgTi2O5) 
1370 

Y. Shibue 
Calculations of  fluid?ternary solid solution equilibria: An
application of the Wilson  equation to  fluid?(Fe,Mn,Mg)TiO3
equilibria at 600 C and 1 kbar 
1375 


Robert A. Fellows,  Alistair R. Lennie,  Andreas W. Munz, David
J. Vaughan, and  Geoff Thornton 
Structures of FeTiO3 (0001) surfaces observed by scanning tunneling
microscopy 
1384 

Diana K. Fisler and  Randall T. Cygan 
Diffusion of Ca and Mg in calcite 
1392 

Rolf Heinemann, Veronika Staack, Arne Fischer, 
Herbert Kroll, Thomas Vad, and Armin Kirfel
Temperature dependence of Fe,Mg partitioning in
Acapulco olivine 
1400  

R.M. Wilson, J.C. Elliott, and S.E.P. Dowker 
Rietveld refinement of the crystallographic structure
of human dental enamel apatites 
1406

Stephen Guggenheim and Wudi Zhan
Crystal structures of two partially dehydrated
chlorites: The "modified" chlorite structure 
1415

Anne Bosenick, Charles A. Geiger, and Brian L. Phillips 
Local Ca-Mg distribution of Mg-rich pyrope-grossular
garnets synthesized at different temperatures
revealed by 29Si MAS NMR spectroscopy 
1422 

S?ren K. Lausen, Holger Lindgreen, Hans J. Jakobsen, and Niels C. Nielsen
Solid-state 29Si MAS NMR studies of illite and illite-smectite from shale
1433 

Petr Ondrus, Roman Sk?la, Cecilia Viti, Frantisek Veselovsky?,
Frantisek Nov?k, and Jir? Jansa
Parascorodite, FeAsO4 2H2Oa new mineral from Kank near
Kutn? Hora, Czech Republic
1439 

G. Artioli and E. Galli 
Gonnardite: Re-examination of holotype material and
discreditation of tetranatrolite 
1445 


LETTERS

S.L. Tagg, Herman Cho, M. Darby Dyar, and  Edward S. Grew 
Tetrahedral boron in naturally occurring
tourmaline 
1451 

Peter C. Burns and Robert J. Finch 
Wyartite: Crystallographic evidence for the first
pentavalent-uranium mineral
1456

Reinhard Wulf, George Calas, Aline Ramos,  Heinz B?ttner, 
Knut Roselieb, and Matthias Rosenhauer
Structural environment of krypton dissolved in
vitreous silica 
1461  

NEW MINERAL NAMES 1464 

ERRATUM 1468