American Mineralogist

Volume 72, Issue no. 1112 : November - December 1987

REGULAR ARTICLE

1051 β-Mg2SiO4: A potential host for water in the mantle?

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1056 Effects of B and H2O on liquidus phase relations in the haplogranite system at 1 kbar

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1071 Solubility of carbon dioxide in albitic melt

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1086 Petrology of a Georgia Blue Ridge amphibolite unit with hornblende + gedrite + kyanite + staurolite

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1097 Alteration of amphibolitic wallrocks around the Tanco rare-element pegmatite, Bernic Lake, Manitoba

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1122 Cryolite-bearing and rare metal-enriched rhyolite, Sierra Blanca Peaks, Hudspeth County, Texas

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1131 Laser-interference and Nomarski interference imaging of zoning profiles in plagioclase phenocrysts from the May 18, 1980, eruption of Mount St. Helens, Washington

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1144 Laser-interferometry study of oscillatory zoning in plagioclase: The record of magma mixing and phenocryst recycling in calc-alkaline magma chambers, Iztaccihuatl volcano, Mexico

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1163 Complex stacking sequences in a lepidolite from Tørdal, Norway

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1170 High-pressure differential thermal analysis (HP-DTA) of the dehydroxylation of Na-rich montmorillonite and K-exchanged montmorillonite

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1176 Ashcroftine, ca. K10Na10(Y,Ca)24(OH)4(CO3)16(Si56O140)·16H2O, a structure with enormous polyanions

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1190 High-resolution solid-state 27Al NMR spectroscopy of Mg-rich vesuvianite

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1195 X-ray diffraction and 29Si magic-angle-spinning NMR of opals: Incoherent long- and short-range order in opal-CT

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1204 Incorporation of Al, Mg, and water in opal-A: Evidence from speleothems

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1211 Fibers and cylinders of cryptomelane-hollandite in Permian bedded salt, Palo Duro Basin, Texas

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1225 Crystal structure of grischunite

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1230 Crystal structures and crystal chemistry of the uranyl oxide hydrates becquerelite, billietite, and protasite

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1239 Synthesis of metastable Ca-Mg carbonates

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1241 Effects of temperature and degree of supersaturation on pyrite morphology

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1251 Perroudite, a new sulfide-halide of Hg and Ag from Cap-Garonne, Var, France, and from Broken Hill, New South Wales, and Coppin Pool, Western Australia

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1257 Crystal structure and crystal chemistry of perroudite: A mineral from Coppin Pool, Western Australia

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1263 Quantitative analysis of REEs by SIMS

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1269 Formal definitions of type mineral specimens

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BOOK REVIEW

1279 BOOK REVIEWS

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MEMORIAL

1271 Memorial of Ogden L. Tweto

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1273 Memorial of Kenneth DePencier Watson

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1275 Memorial of James Phemister

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1277 Memorial of Takeo Watanabe

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INDEX

1280 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.