American Mineralogist

Volume 68, Issue no. 0102 : January - February 1983

REGULAR ARTICLE

1 A review of structural resonance and the nature of long-range interactions in modulated mineral structures

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11 Modulated structures at phase transitions

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18 Modulated and intergrowth structures in minerals and electron microscope methods for their study

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41 Phase transitions and decomposition relations in calcic plagioclase

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60 The mechanism and kinetics of Al,Si ordering in Mg-cordierite

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66 Theory of nucleation in silicate melts

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78 Petrology and geochemistry of metamorphosed ultramafic bodies in a portion of the Blue Ridge of North Carolina and Virginia

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95 Diffusion data for clinopyroxenes from homogenization and self-diffusion experiments

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106 Interdiffusion of K and Na in alkali feldspars: homogenization experiments

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112 Variations in the chemical compositions and lattice dimensions of (Ba,K,Na)-feldspars from Otjosondu, Namibia and their significance

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122 Al,Si distribution in a ternary (Ba,K,Na)-feldspar as determined by crystal structure refinement

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125 Oscillatory zoning of plagioclase: Nomarski interference contrast microscopy of etched polished sections

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130 The crystal structure of a Li, Be-rich brittle mica: a dioctahedral trioctahedral intermediate

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143 Exsolution of ilmenite and rutile in hornblende

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156 The 3T, 4T and 5T polytypes of wollastonite from Kushiro, Hiroshima Prefecture, Japan

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164 Composition, order-disorder and lattice parameters of olivines: relationships in silicate, germanate, beryllate, phosphate and borate olivines

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177 Substitution of Ti for Si in titanite and new end-member cell dimensions for titanite

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181 Simple spinels: crystallographic parameters, cation radii, lattice energies, and cation distribution

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195 Magnetite in the carbonatites from the Jacupiranga Complex, Brazil

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214 Balangeroite, a new fibrous silicate related to gageite from Balangero, Italy

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220 A Brillouin-zone model for compositional variation in tetrahedrite

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227 Tetrahedrite-tennantite series compositional variations in the Cofer Deposit, Mineral District, Virginia

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235 Laffittite, AgHgAsS3: crystal structure and second occurrence from the Getchell mine, Nevada

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245 Orickite and coyoteite, two new sulfide minerals from Coyote Peak, Humboldt County, California

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255 The crystal structure of sulfoborite, Mg3SO4(B(OH)4)2(OH)F

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262 Calciobetafite (new mineral of the pyrochlore group) and related minerals from Campi Flegrei, Italy; crystal structures of polymignyte and zirkelite: comparison with pyrochlore and zirconolite

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277 Symbols for rock-forming minerals

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NEW MINERAL NAMES

280 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.