American Mineralogist

Volume 71, Issue no. 0102 : January - February 1986

REGULAR ARTICLE

1 Feldspar solid solutions

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17 The mineralogy of K-richterite-bearing lamproites

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38 Raman spectroscopic study of the SiO2- Al2O3-K2O vitreous system: distribution of silicon second neighbors

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51 High-chlorine amphiboles from oceanic rocks: product of highly-saline hydrothermal fluids?

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60 Mg-rich hollow sanidine in partially melted granite xenoliths in a mica peridotite at Rose dome, Woodson County, Kansas

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68 A kinetic study of clinochlore and its high temperature equivalent forsterite-cordierite-spinel at 2 kbar water pressure

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78 Morphologies and growth mechanisms of synthetic Mg-chlorite and cordierite

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85 Kinetics of mineral-water reactions: theory, design and application of circulating hydrothermal equipment

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95 A spectroscopic study of blue radiation coloring in plagioclase

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99 Pressure-induced band splitting in infrared spectra of sanidine and albite

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105 EPR study of Fe3+ centers in cristobalite and tridymite

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111 Nature of phases synthesized along the join (Mg,Mn)2Si2O6

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123 Grandite garnet from Nevada: confirmation of origin of iridescence by electron microscopy and interpretation of a moiré- like texture

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127 Local states of Fe2+ and Mg2+ in magnesium-rich olivines

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136 Cation partitioning in hydrothermally prepared olivine-related (Fe,Mn)-sarcopsides

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142 Ionic modeling of mineral structures and energies in the electron gas approximation: TiO2 polymorphs, quartz, forsterite, diopside

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151 Spectral reflectance of carbonate minerals in the visible and near infrared (0.35-2.55 microns): calcite, aragonite, and dolomite

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163 Crystal structure refinement of huntite, CaMg3(CO3)4, with X-ray powder data

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167 Alteration profiles and impurity element distributions in magnetic fractions of weathered ilmenite

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176 X-ray and HRTEM structure analysis of orientite

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188 Thalenite from Arizona

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194 Direct imaging of tunnel cations in zinkenite by high-resolution electron microscopy

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202 Refinement of the crystal structure of krausite: a mineral with an interpolyhedral oxygen-oxygen contact shorter than the hydrogen bond

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206 Lammerite, Cu3(AsO4)2, a modulated close-packed structure

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210 Renierite, Cu10ZnGe2Fe4S16- Cu11GeAsFe4S16: a coupled solid solution series

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222 The crystal structure of Fe2+Fe3+2(PO3OH)4(H2O)4: a new synthetic compound of mineralogic interest

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NEW MINERAL NAMES

227 NEW MINERAL NAMES

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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.