American Mineralogist

Volume 76, Issue no. 1112 : November - December 1991

MSA PRESIDENTIAL ADDRESS

1781 PRESIDENTIAL ADDRESS The eye of the petrographer, the mind of the petrologist

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REGULAR ARTICLE

1811 ARTICLES Structural defects in synthetic tremolitic amphiboles

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1824 The crystal structure of B-free kornerupine: Conditions favoring the incorporation of variable amounts of B through [4]B ↔ [4]Si substitution in kornerupine

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1836 The crystal chemistry of the milarite-group minerals

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1857 Ordering of divalent cations in the apatite structure: Crystal structure refinements of natural Mn- and Sr-bearing apatite

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1863 A solid state 29Si nuclear magnetic resonance study of opal and other hydrous silicas

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1872 Stepwise dehydration of heulandite-clinoptilolite from Succor Creek, Oregon, U.S.A.: A single-crystal X-ray study at 100 K

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1884 Crystallographic investigations of [Mg(H2O)6]XCl3 double salts (X+ = K+, Rb+, Cs+, NH+4): Crystal structure of [Mg(H2O)6]CsCl3

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1889 Influence of temperature on the stability of magnesian calcite

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1897 Cation distribution in partially ordered columbite from the Kings Mountain pegmatite, North Carolina

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1905 Mössbauer spectra of minnesotaite and ferroan talc

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1910 A new perspective on staurolite crystal chemistry: Use of stoichiometric and chemical end-members for a mole fraction model

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1920 Compositional constraints on the incorporation of Cl into amphiboles

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1931 Tremolite: New enthalpy and entropy data from a phase equilibrium study of the reaction tremolite = 2 diopside + 1.5 orthoenstatite + &beta-quartz + H2O

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1940 Pt-Fe alloys in experimental petrology applied to high-pressure research on Fe-bearing systems

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1950 Pyroxene-garnet equilibration during cooling in the mantle

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1964 Occurrence and distribution of invisible gold in a Carlin-type gold deposit in China

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1973 Combined freeze-etch replicas and HRTEM images as tools to study fundamental particles and the multiphase nature of 2:1 layer silicates

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1985 Occurrence and crystal structure of Ca-free beusite in the El Sampal IIIA iron meteorite

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1990 Dissakisite-(Ce), a new member of the epidote group and the Mg analogue of allanite-(Ce), from Antarctica

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1998 Boromuscovite, a new member of the mica group, from the Little Three mine pegmatite, Ramona district, San Diego County, California

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2003 Pitiglianoite, a new feldspathoid from southern Tuscany, Italy: Chemical composition and crystal structure

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2013 MacSuite: An integrated compendium of geoscientific programs for the Apple Macintosh

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NEW MINERAL NAMES

2020 NEW MINERAL NAMES

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SOFTWARE NOTICES

2009 SOFTWARE NOTICES Computer programs for petrologic P-T-t path calculations

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MEMORIAL

2027 Memorial of Alfred Oswald Woodford

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AUTHOR INDEX

2030 AUTHOR INDEX

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SUBJECT INDEX

2040 SUBJECT INDEX

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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.