American Mineralogist

Volume 84, Issue no. 04 : April 1999

LETTER

677 Elasticity of MgSiO3 orthoenstatite

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681 Single-crystal structure refinement of synthetic M4K-substituted potassic richterite K(KCa)Mg5Si8O22(OH)2

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REGULAR ARTICLE

465 Densities of melts in the CaO-MgO-Al2O3-SiO2 system

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477 Modeling of the solubility of a two-component H2O + CO2 fluid in silicate liquids

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493 Dynamic electrochemical assessment of redox reactions in natural micas between 613 and 1373 K at 105 Pa

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506 Energetics of kaolin polymorphs

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517 Peristerite exsolution in metamorphic plagioclase from the Lepontine Alps: An analytical and transmission electron microscope study

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528 New kinetic model for the nanocrystalline anatase-to-rutile transformation revealing rate dependence on number of particles

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536 Iron in kornerupine: A 57Fe Mössbauer spectroscopic study and comparison with single-crystal structure refinement

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550 Raman spectroscopic identification of B-free and B-rich kornerupine (prismatine)

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555 In situ neutron diffraction study of non-convergent cation ordering in the (Fe3O4)1-x(MgAl2O4)x spinel solid solution

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564 Magnetite lamellae in olivine and clinohumite from Dabie UHP ultramafic rocks, central China

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570 “Why most “”dry”” rocks should cool “”wet”””

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581 Complex zoning in apatite from the Idaho batholith: A record of magma mixing and intracrystalline trace element diffusion

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596 Ca-Sr distribution between amphibole, clinopyroxene, and chloride-bearing solutions

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607 The smectite to chlorite transition in the Chipilapa geothermal system, El Salvador

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620 Dissolution of well and poorly crystallized kaolinites: Al speciation and effects of surface characteristics

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629 Surface chemical characterization and surface diffraction effects of real margarite (001): An angle-resolved XPS investigation

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639 Properties of As and S at NiAs, NiS, and Fe1-xS surfaces, and reactivity of niccolite in air and water

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650 The Gibbs free energies and enthalpies of formation of U6+ phases: An empirical method of prediction

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665 Schubnelite, [Fe3+(V5+O4)(H2O)], a novel heteropolyhedral framework mineral

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669 Toward the crystal structure of nagyagite, [Pb(Pb,Sb)S2] [(Au,Te)]

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NEW MINERAL NAMES

685 NEW MINERAL NAMES

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BOOK REVIEW

689 X-Ray Diffraction and the Identication and Analysis of Clay Minerals, 2nd Edition. By D. M. Moore and R. C. Reynolds Jr. Oxford, New York, 1997, 378 p.

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689 X-Ray Charge Densities and Chemical Bonding. By P. Coppens, Oxford University Press, 1997, 358 p.

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SPECIAL NOTICE: WEB PAPER

691 The IMA Commission on New Minerals and Mineral Names: Procedures and guidelines on mineral nomenclature, 1998

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ERRATA

692 Intrusive chemical characterization of tourmaline: Mössbauer study of Fe valance and site occupancy. (Am. Mineral., 83, 848-864, 1998)

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692 Stability of high-Al titanite from low-pressure calcsilicates in light of fluid and host-rock composition. (Am. Mineral., 84, 37-47, 1999)

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DEPOSIT ITEMS

669 Toward the crystal structure of nagyagite, [Pb(Pb,Sb)S2] [(Au,Te)]

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TABLE OF CONTENTS
&
SPECIAL COLLECTIONS

Table of Contents

AmMin submission to acceptance/”first publication” is at a record average of about three to four months. Our acceptance to “final” publication is presently another 13 months on average.

Special Collections

American Mineralogist is an international journal that publishes mineralogical papers of broad interest to the geoscience and materials science community.