American Mineralogist
MSA PRESIDENTIAL ADDRESS
649 Thermodynamics and petrology of cummingtonite
LETTER
861 Silicate species exchange, viscosity, and crystallization in a low-silica melt: In situ high-temperature MAS NMR spectroscopy
865 “Hydrothermal diamond-anvil cell study of melts: Eutectic melting of the assemblage Ca(OH)2 + CaCO3 with excess H2O and lack of evidence for “”portlandite II”” phase”
869 Modeling the X-ray diffraction pattern of opal-CT
REGULAR ARTICLE
664 Characterization of Mg-rich maghemite from tuffite
670 Atomic radii of noble gas elements in condensed phases
676 Structural parallels between the high-pressure B phases and the leucophoenicite series
680 Tetrahedral rigid-body motion in silicates
691 29Si MAS NMR and IR spectroscopic investigation of synthetic pyrope-grossular garnet solid solutions
705 Si-Al order in leucite revisited: New information from an analcite-derived analogue
715 Mica polytypism: Identification and origin
725 Electrochemical oxidation of chalcopyrite (CuFeS2) and the related metal-enriched derivatives Cu4Fe5S8, Cu9Fe9S16, and Cu9Fe8S16
732 Geochemical alteration of pyrochlore group minerals: Pyrochlore subgroup
744 Experimentally determined activity-composition relations for Ca-rich scapolite in the system CaAl2Si2O8-NaAISi3O8-CaCO3 at 7 kbar
752 Experimentally determined solidi in the Ca-bearing granite system NaAISi3O8-CaAl2Si2O8-KAISi3O8 -SiO2-H2O-CO2
757 The oxygen isotope anatomy of a slowly cooled metamorphic rock
765 Incongruent dissolution of REE- and Sr-rich apatite in peraluminous granitic liquids: Differential apatite, monazite, and xenotime solubilities during anatexis
776 Textures and Sr, Ba, Mg, Fe, K, and Ti compositional profiles in volcanic plagioclase: Clues to the dynamics of calc-alkaline magma chambers
799 Archean mantle heterogeneity and the origin of diamondiferous eclogites, Siberia: Evidence from stable isotopes and hydroxyl in garnet
810 Armalcolite in crustal paragneiss xenoliths, central Mexico
823 Oscillatory zoning in meteoritic forsterite
833 An Fe analogue of kinoshitalite from the Broken Hill massive sulfide deposit in the Namaqualand Metamorphic Complex, South Africa
841 Crystal structure of hillebrandite: A natural analogue of calcium silicate hydrate (CSH) phases in Portland cement
NEW MINERAL NAMES
845 NEW MINERAL NAMES
AWARD
851 Presentation of the Roebling Medal of the Mineralogical Society of America for 1994 to William A. Bassett
852 Acceptance of the Roebling Medal of the Mineralogical Society of America for 1994
854 Presentation of the Mineralogical Society of America Award for 1994 to Ronald E. Cohen
855 Acceptance of the Mineralogical Society of America Award for 1994
857 Presentation of the Distinguished Public Service Medal for 1994 to Konrad Bates Krauskopf
859 Acceptance of the Distinguished Public Service Medal for 1994
DEPOSIT ITEMS
732 Geochemical alteration of pyrochlore group minerals
TABLE OF CONTENTS
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SPECIAL COLLECTIONS
Table of Contents
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American Mineralogist is an international journal that publishes mineralogical papers of broad interest to the geoscience and materials science community.