American Mineralogist

Volume 75, Issue no. 0304 : March - April 1990

LETTER

439 LETTER A high-pressure phase transition of corundum predicted by the potential induced breathing model

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REGULAR ARTICLE

247 ARTICLES An EXAFS study of thiospinel minerals

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256 Molecular orbital (SCF-Xα-SW) theory of Fe2+-Mn3+, Fe3+-Mn2+, and Fe3+-Mn3+ charge transfer and magnetic exchange in oxides and silicates

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262 Electron-spin-resonance study of Mn2+ in natural wollastonite

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267 Layer-stacking sequences and structural disorder in mixed-layer illite/smectite: Image simulations and HRTEM imaging

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276 Interpreting one-dimensional high-resolution transmission electron micrographs of sheet silicates by computer simulation

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289 Disordered intergrowths in lead-arsenic sulfide minerals and the paragenesis of the sartorite-group minerals

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295 Crystal structures of natural ternary apatites: Solid solution in the Ca5(PO4)3X (X = F, OH, Cl) system

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305 Crystal-structure refinements of 1M plutonic biotites

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314 Crystal structure refinement of a F-bearing spessartine garnet

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319 Activity-composition relationships of binary Ca-Fe and Ca-Mn garnets determined by reversed, displaced equilibrium experiments

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328 Mixing properties of Ca-Mg-Fe-Mn garnets

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345 The system tonalite-H2O at 15 kbar and the genesis of calc-alkaline magmas

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358 Comparison of the high-temperature and high-pressure stability limits of synthetic and natural tremolite

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367 Calculated mineral equilibria in the pelite system, KFMASH (K2O-FeO-MgO-Al2O3-SiO2-H2O)

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381 Quartz pseudomorphs after coesite in eclogites from Shandong province, east China

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387 Metamorphic fluids in the Notch Peak contact-metamorphic aureole: Evidence from fluid inclusions

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392 Chromium incorporation in mullite

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398 An automated oxygen-fugacity control system for 0.1-MPa high-temperature furnaces

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401 Jahnsite-(CaMnMn), a new member of the whiteite group from Mangualde, Beira, Portugal

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405 Wawayandaite, a new calcium manganese beryllium boron silicate from Franklin, New Jersey

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409 Lithiomarsturite, a new member of the pyroxenoid group, from North Carolina

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415 Werdingite, a new borosilicate mineral from the granulite facies of the western Namaqualand metamorphic complex, South Africa

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424 MINTAB: A general-purpose mineral recalculation and tabulation program for Macintosh microcomputers

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NEW MINERAL NAMES

431 NEW MINERAL NAMES

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SOFTWARE NOTICES

421 SOFTWARE NOTICES AMPHIBOL: A program for calculating structural formulae and for classifying and plotting chemical analyses of amphiboles

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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.