American Mineralogist

Volume 82, Issue no. 0708 : July - August 1997

LETTER

836 Transformation of fivefold-coordinated silicon to octahedral silicon in calcium silicate, CaSi2O5

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REGULAR ARTICLE

657 All-atom ab initio energy minimization of the kaolinite crystal structure

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663 Crystal chemistry of forsterite: A first-principles study

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672 Ab initio calculation of the pleochroism of fayalite

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677 Anti-phase boundaries and phase transitions in titanite: An X-ray diffraction study

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682 The equation of state and high-pressure behavior of magnesite

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689 Thermal expansion of MgSiO3 and FeSiO3 ortho- and clinopyroxenes

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697 The synthetic Cr2+ silicates BaCrSi4O10 and SrCrSi4O10: The missing links in the gillespite-type ABSi4O10 series

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708 A Rietveld and infrared study of synthetic amphiboles along the potassium-richterite-tremolite join

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717 Particle size effects on transformation kinetics and phase stability in nanocrystalline TiO2

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729 Dehydration dynamics of stilbite using synchrotron X-ray powder diffraction

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740 Mn3Al2Si3O12 spessartine and Ca3Al2Si3O12 grossular garnet: Structural dynamic and thermodynamic properties

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748 Synthesis methods and unit-cell volume of end-member titanite (CaTiOSiO4)

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754 Thermochemistry and the enthalpy of formation of synthetic end-member (CaTiSiO5) titanite

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760 Ab-initio synthesis and TEM confirmation of antigorite in the system MgO-SiO2-H2O

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765 Experimental study of Th-bearing LaPO4 (780 °C, 200 MPa): Implications for monazite and actinide orthophosphate stability

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772 Monazite-xenotime thermobarometry: Experimental calibration of the miscibility gap in the binary system CePO4-YPO4

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781 Experimental investigation of laumontite → wairakite + H2O: A model diagenetic reaction

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790 Eliminating closure in mineral formulae with specific application to amphiboles

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807 Dessauite, (Sr,Pb)(Y,U)(Ti,Fe3+)20O38, a new mineral of the crichtonite group from Buca della Vena mine, Tuscany, Italy

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812 A hydrous Ca-bearing magnesium carbonate from playa lake sediments, Salines Lake, Spain

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NEW MINERAL NAMES

820 NEW MINERAL NAMES

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AWARD

824 Presentation of the Roebling Medal of the Mineralogical Society of America for 1996 to Donald H. Lindsley

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826 Acceptance of the Roebling Medal of the Mineralogical Society of America for 1996

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829 Presentation of the Mineralogical Society of America Award for 1996 to Donald B. Dingwell

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831 Acceptance of the Mineralogical Society of America Award for 1996

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833 Presentation of the Distinguished Public Service Medal for 1996 to Robert I. Tilling

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834 Acceptance of the Distinguished Public Service Medal for 1996

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BOOK REVIEW

840 CRYSTALLOGRAPHY, second edition. By W. Borchardt-Ott Springer, Berlin, Germany, 1995. 307 pages

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DEPOSIT ITEMS

682 The equation of state and high-pressure behavior of magnesite

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708 A Rietveld and infrared study of synthetic amphiboles along the potassium-richterite-tremolite join

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807 Dessauite, (Sr,Pb)(Y,U)(Ti,Fe3+)20O38, a new mineral of the crichtonite group from Buca della Vena mine, Tuscany, Italy

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TABLE OF CONTENTS
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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.