American Mineralogist

Volume 75, Issue no. 1112 : November - December 1990

LETTER

1438 LETTERS Scanning tunneling microscopy of defects in Ag- and Sb-bearing galena

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REGULAR ARTICLE

1231 ARTICLES Shear viscosities of galliosilicate liquids

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1238 Infrared spectra of GeO2 with the rutile structure and prediction of inactive modes for isostructural compounds

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1249 Rietveld refinement of the high-pressure polymorph of Mn3O4

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1253 A study of the mean-square displacement amplitudes of Si, Al, and O atoms in framework structures: Evidence for rigid bonds, order, twinning, and stacking faults

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1268 Computer simulation of feldspar structures

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1274 Crystal chemistry of synthetic pyroxenes on the join CaNiSi2O6-CaMgSi2O6 (diopside): A Rietveld structure refinement study

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1282 Formation of coexisting 1M and 2M polytypes in illite from an active hydrothermal system

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1290 Nitrogen-defect aggregation characteristics of some Australasian diamonds: Time-temperature constraints on the source regions of pipe and alluvial diamonds

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1311 The solubility of carbon dioxide in rhyolitic melts: A quantitative FTIR study

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1327 Experimental investigation of andradite and hedenbergite equilibria employing the hydrogen sensor technique, with revised estimates of Δƒ,Gom,298 for andradite and hedenbergite

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1342 The breakdown of hercynite at low ƒO2

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1349 Amphibolite-facies-to-granulite-facies reactions in experimentally deformed, unpowdered amphibolite

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1362 Hydrothermal melting behavior of KAlSi3O8 as microcline and sanidine

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1370 The thermodynamic properties of dumortierite Si3B[Al6.75[]0.25O17.25(OH)0.75]

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1376 Estimating the free energy of formation of silicate minerals at high temperatures from the sum of polyhedral contributions

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1381 Homogenizing rhyolitic glass inclusions from the Bishop Tuff

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1399 The assemblage WO2+H2O as a steady-state hydrogen source in moderately reduced hydrothermal experiments

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1406 Estimation of elemental microvariation within minerals analyzed by the microprobe: Use of model population estimates

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1415 Montesommaite, (K,Na)9Al9Si23O64·10H2O, a new zeolite related to merlinoite and the gismondine group

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1421 Francisite, Cu3Bi(SeO3)2O2Cl, a new mineral from Iron Monarch, South Australia: Description and crystal structure

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1428 SPINEL and SPINELTAB: Macintosh programs to plot spinel analyses in the three-dimensional oxidized (magnetite) and reduced (ulvöspinel) prisms

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1443 Alkylammonium ion treatment of clay minerals in ultrathin section: A new method for HRTEM examination of expandable layers

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1447 Alpha-decay-induced condensation of phosphate anions in a mineral

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NEW MINERAL NAMES

1431 NEW MINERAL NAMES

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SOFTWARE NOTICES

1426 SOFTWARE NOTICES PX: A program for pyroxene classification and calculation of end-members

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MEMORIAL

1451 MEMORIAL Memorial of Gunnar Kullerud

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ERRATA

1375 ERRATUM

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AUTHOR INDEX

1453 AUTHOR INDEX

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SUBJECT INDEX

1461 SUBJECT INDEX

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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.