American Mineralogist
REGULAR ARTICLE
0 Introduction
1075 Geology of the Silsilah ring complex, and associated tin mineralization, Kingdom of Saudi Arabia-a synopsis
1087 Geochemistry and REE minerals of nepheline syenites from the Motzfeldt Centre, South Greenland
1101 The Oka carbonatite complex, Quebec: geology and evidence for silicate-carbonate liquid immiscibility
1114 Mineralogy and partial melting of fenitized crustal xenoliths in the Oldoinyo Lengai carbonatitic volcano, Tanzania
1127 Polylithionite from the rare-metal deposits of the Blachford Lake alkaline complex, N.W.T., Canada
1135 Rare-earth element minerals in four carbonatites near Gatineau, Quebec
1143 The origin of Al-rich spinel inclusions in leucite from the leucite lamproites of Western Australia
1151 Petrology, geochemistry and origin of the Big Branch and Red Mountain gneisses, southeastern Llano Uplift, Texas
1164 Systematics of intrinsic oxygen fugacity-temperature relationships in multi-phase assemblages
1169 The high temperature behavior of trace hydrous components in silicate minerals
1180 Amethyst color in quartz, the result of radiation protection involving iron
1186 Color centers in sodalite
1193 Coexisting paragonite-phengite in blueschist eclogite: a TEM study
1205 Chemical variations in sodium gedrite from Labrador
1211 Compositional variation of naturally occurring rhoenite
1217 Tourmaline solid solutions in the system MgO-Al2O3-SiO2-B2O3-H2O
1224 An experimental study of hydroxyl groups and water in synthetic and natural zircons: a model of the metamict state
1232 Oriented hematite inclusions in sillimanite
1238 Molecular mimicry of the geometry and charge density distribution of polyanions in borate minerals
1248 Electron ordering in ilvaite, a mixed-valence iron silicate: crystal structure refinement at 138 K
1253 Microstructures and orientation relationships in the dry-state aragonite-calcite and calcite-lime phase transformations
1262 Electronic spectra of Fe3+ oxides and oxide hydroxides in the near IR to near UV
1270 Thermodynamic properties of tetrahedrite-tennantites: constraints on the interdependence of the Ag ↔ Cu, Fe ↔ Zn, Cu ↔ Fe, and As ↔ Sb exchange reactions
1290 The reduced uraniferous mineralizations associated with the volcanic rocks of the Sierra Pena Blanca (Chihuahua, Mexico)
1298 Crystal structure refinement of anandite-2Or, a barium- and sulphur-bearing trioctahedral mica
1309 Refinement of the structure of carnallite, Mg(H2O)6KCl3
1314 Gysinite, Pb(Nd,La)(CO3)2(OH)·H2O, a new lead, rare-earth carbonate from Shinkolobwe, Shaba, Zaire and its relationship to ancylite
1318 Comparison chart for estimating volume percentages of constituents in rocks and concentrates in the range of 1.0 to 0.1 volume percent
1320 Mixing properties of aluminosilicate garnets: constraints from natural and experimental data, and applications to geothermo-barometry: Clarifications
NEW MINERAL NAMES
1329 NEW MINERAL NAMES
BOOK REVIEW, NOTICES and ERRATA
1335 BOOK REVIEWS & NOTICES & ERRATA
PROCEEDINGS
1324 Report of the Treasurer for 1984
1327 Report of the Financial Advisory Committee for 1984
MEMORIAL
1321 Memorial of David R. Wones
INDEX
1339 INDEX
TABLE OF CONTENTS
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SPECIAL COLLECTIONS
Table of Contents
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Special Collections
American Mineralogist is an international journal that publishes mineralogical papers of broad interest to the geoscience and materials science community.