American Mineralogist

An International Journal of Earth and Planetary Materials

Vol. 83, No. 3-4

March-April 1998


Letter

A.B. Woodland and R.J. Angel

Crystal structure of a new spinelloid with the wadsleyite structure in the system Fe2SiO4-Fe3O4 and implications for the Earth's mantle, 404

 


Articles

L.Y. Aranovich and R.C. Newton

Reversed determination of the reaction: Phlogopite + quartz = enstatite + potassium feldspar + H2O in the ranges 750-875 ºC and 2-12 kbar at low H2O activity with concentrated KCl soluctions, 193


T.B. Bai and A.F. Koster van Groos

Phase relations in the system MgO-NaCl-H2O: The dehydroxylation of brucite in the presence of NaCl-H2O fluids, 205


Andrea M. Koziol and Robert C. Newton

Experimental determination of the reaction: Magnesite + enstatite = forsterite + CO2 in the ranges 6-25 kbar and 700-1100 ºC, 213


Thomas Fockenberg

An experimental study of the pressure-temperature stability of MgMgAl-pumpellyite in the system MgO-Al2O3-SiO2-H2O, 220


Jennifer M. Pickering, Brandon E. Schwab, and A. Dana Johnston

Off-center hot spots: Double thermocouple determination of the thermal gradient in a 1.27 cm (1/2 in.) CaF2 piston-cylinder furnace assembly, 228


D.B. Dingwell, K.-U. Hess, and C. Romano

Viscosity data for hydrous peraluminous granitic melts: Comparison with a metaluminous model, 236


Akiko Nagasaki and Masaki Enami

Sr-bearing zoisite and epidote in ultra-high pressure (UHP) metamorphic rocks from the Su-Lu province, eastern China: An important Sr reservoir under UHP conditions, 240


Fritz Finger, Igor Broska, Malcolm P. Roberts, and Andreas Schermaier

Replacement of primary monazite by apatite-allanite-epidote coronas in an amphibolite facies granite gneiss from the eastern Alps, 248


Hans-Jürgen Förster

The chemical composition of REE-Y-Th-U-rich accessory minerals in peraluminous granites of the Erzgebirge-Fichtelgebirge region, Germany, Part I: The monazite-(Ce)-brabantite solid solution series, 259


Martin Radvanec, Shohei Banno, and W.G. Ernst

Chemical microstructure of Franciscan jadeite from Pacheco Pass, California, 273


Jianzhong Zhang, Isabelle Martinez, Francois Guyot, and Richard J. Reeder

Effects of Mg-Fe2+ substitution in calcite-structure carbonates: Thermoelastic properties, 280


Hexiong Yang, Robert M. Hazen, Charles T. Prewitt, Larry W. Finger, Ren Lu, and Russell J. Hemley

High-pressure single-crystal X-ray diffraction and infrared spectroscopic studies of the C2/m-P21/m phase transition in cummingtonite, 288


Delphine Cabaret, Philippe Sainctavit, Philippe Ildefonse, and Anne-Marie Flank

Full multiple scattering calculations of the X-ray absorption near edge structure at the magnesium K-edge in pyroxene, 300


H.W. Nesbitt and D. Banerjee

Interpretation of XPS Mn(2p) spectra of Mn oxyhydroxides and constraints on the mechanism of MnO2 precipitation, 305


M.J. Scaini, G.M. Bancroft, and S.W. Knipe

Reactions of aqueous Au1+ sulfide species with pyrite as a function of pH and temperature, 316


François Farges

Mineralogy of the Louvres Merovingian garnet cloisonné jewelry: Origins of the gems of the first kings of France, 323


Andrzej Grzechnik and Paul F. McMillan

Temperature dependence of the OH- absorption in SiO2 glass and melt to 1975 K, 331


Yeongkyoo Kim and R. James Kirkpatrick

High-temperature multi-nuclear NMR investigation of analcime, 339


Jillian F. Banfield and Takashi Murakami

Atomic-resolution transmission electron microscope evidence for the mechanism by which chlorite weathers to 1:1 semi-regular chlorite-vermiculite, 348


Toshihiro Kogure and Takashi Murakami

Structure and formation mechanism of low-angle grain boundaries in chlorite, 358


Mihály Pósfai and Margareta Sundberg

Stacking disorder and polytypism in enargite and luzonite, 365


Mihály Pósfai and Peter R. Buseck

Relationships between microstructure and composition in enargite and luzonite, 373


Halil Sarp and Radovan Cerny

Description and crystal structure of Yvonite, Cu(AsO3OH)2H2O, 383


Mark A. Cooper, Frank C. Hawthorne, Andrew C. Roberts, Joel D. Grice, John A.R. Stirling, and Elizabeth A. Moffatt

Georgeericksenite, Na6CaMg(IO3)6(CrO4)2(H2O)12, a new mineral from Oficina Chacabuco, Chile: Description and crystal structure, 390

Deposit Table 4


New Mineral Names 400