American Mineralogist

Volume 57, Issue no. 0102 : January - February 1972

REGULAR ARTICLE

1 The crystal structure of pararammelsbergite (NiAs2)

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10 Kinetics and mechanism of the anatase/rutile transformation, as catalyzed by ferric oxide and reducing conditions

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24 Sarcopside: Its atomic arrangement

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36 “Some aspects of the structural relationship between “”Messbach-type”” and “”Lucin-type”” variscites”

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45 The crystal structure of heterosite

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52 Electron spin resonance of Mn2+ impurities in newberyite

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62 Crystal structures of the high pressure polymorphs of Mn2GeO4

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76 High pressure transformations in MnSiO3

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85 Chemical composition and physical, optical, and structural properties of benitoite, neptunite, and joaquinite

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103 The effect of cation substitutions on the physical properties of trioctahedral micas

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130 Monatomic metal vapor pressures from minerals

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137 Argentian pentlandite from some Finnish sulfide deposits

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146 Synthesis and stability of montbrayite, Au2Te3

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155 Subsolidus phase relations in aragonite-type carbonates: II. The systems CaCO3-SrCO3-PbCO3 and CaCO3-BaCO3-PbCO3

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169 Compositional variations in synthetic topaz

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188 Phenocrysts and glass inclusions and their bearing on oxidation and mixing of basaltic magmas, Kilauea Volcano, Hawaii

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217 Composition of liquidus chromite from the 1959 (Kilauea Iki) and 1965 (Makaopuhi) eruptions of Kilauea volcano. Hawaii

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231 Differential dispersion measurement of refraction index

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237 A refined fusion X-ray fluorescence technique, and determination of major and minor elements in silicate standards

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246 Fluoride loss from silicates on ignition

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272 Beryl from the Oxford Mine, Troup County Georgia

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277 Structural chemistry of barysilite-type compounds XY2(Pb2Si2O7)3

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281 Sample preparation for X-ray fluorescence analysis: Li-borate glass disks

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284 A low temperature crushing technique applied to manganese nodules

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287 The staining mechanism of potassium feldspar and the origin of hieratite

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292 Conditions for direct formation of gibbsite from K-feldspar-discussion

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294 Conditions for direct formation of gibbsite from K-feldspar-further discussion

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300 Stability of biotite: A discussion

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316 Stability of biotite: A reply

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318 American Crystallographic Association: Session on Mineralogical Crystallography

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NEW MINERAL NAMES

325 New Mineral Names

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MINERALOGICAL NOTES

269 MINERALOGICAL NOTES New data on griphite

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NOTES

337 Notices

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BOOK REVIEW

255 REVIEW Factor group analysis of the vibrational spectra of crystals: A review and consolidation

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330 Book Reviews

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PROCEEDINGS

343 List of Officers and Committees

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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.