American Mineralogist
REGULAR ARTICLE
339 Uniqueness versus conformity to pattern in petrogenesis
349 Wardsmithite, 5CaO·MgO·12B2O3·30H2O, new borate mineral from the Death Valley Region, California
358 Makatite, a new hydrous sodium silicate mineral from Lake Magadi, Kenya
367 The crystal of SnTa2O7, thoreaulite, an example of tin in five-fold coordination
378 Crystal structures and mineral chemistry of double-salt hydrates: II. The crystal structure of loeweite
387 Crystal structure of stilbite
398 Thermal activation energy of shocked and strained quartz
403 Possible topotaxy in the TiO2 system
416 Trapiche emeralds from Chivor and Muzo, Colombia
428 The distribution of uranium, rare earths and color centers in a crystal of natural zircon
441 Crystallographic aspects of the co-crystallization of zeolite L, offretite and erionite
455 An equation for trace element distribution during magmatic crystallization
466 The replacement of calcite by fluorite: a kinetic study
477 Dawsonite and nordstrandite in the Permian Berry Formation of the Sydney Basin, New South Wales
491 Semiquantitative electron microprobe determination of Fe2+/Fe3+ and Mn2+/Mn3+ in oxides and silicates and its application to petrologic problems
505 Confirmation of the mineral species wherryite
508 Ferroglaucophane from New Caledonia
512 P2 omphacite intermediate in composition between jadeite and hedenbergite, from metamorphosed acid volcanics, Bouehndep, New Caledonia
515 Cell dimensions of the hydrated phosphate, kingite
517 The synthesis of chloritoid at low pressures
522 The preparation of fine mineral powders for infrared spectroscopy
525 Copper zoning in pyrite from Cerro de Pasco, Peru: Further discussion
527 Copper zoning in pyrite from Cerro de Pasco, Peru: Reply
528 Chemical reactions in crystals: Corrections and clarification
539 Table of Contents Vol.55
545 Acceptance of the Roebling Medal of the Mineralogical Society of America for 1969
548 Acceptance of the Mineralogical Society of America Award for 1969
639 Constitution and By-Laws of the Mineralogical Society of America
643 Directory of Fellows and Members of the Mineralogical Society of America
691 Geographical List of Members and Fellows
AWARD
541 Presentation of the Roebling Medal of the Mineralogical Society of America for 1969 to Fritz Laves
547 Presentation of the Mineralogical Society of America for 1969 to W. G. Ernst
NEW MINERAL NAMES
533 New Mineral Names
MINERALOGICAL NOTES
502 MINERALOGICAL NOTES: New data on guildite
NOTES
537 Notices
BOOK REVIEW
536 Book Review
PROCEEDINGS
620 Proceedings of the Fiftieth Annual Meeting of the Mineralogical Society of America at Atlantic City, New Jersey
707 List of Officers and Committees
MEMORIAL
551 Memorial of Bertram Theodore Butler
554 Memorial of Horace John Eraser
561 Memorial of Arthur Francis Hallimond
569 Memorial of Riad Abdel-Magid Higazy
573 Memorial of Hisashi Kuno
583 Memorial of Hugh Dinsmore Miser
591 Memorial of Arie Poldervaart
594 Memorial of Joseph Leon Rosenholtz
597 Memorial of Prof. Alfred Schoep
603 Memorial to Marcellus H. Stow
607 Memorial of Bronson F. Stringham
614 Memorial of Harold Douglas Wright
TABLE OF CONTENTS
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SPECIAL COLLECTIONS
Table of Contents
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American Mineralogist is an international journal that publishes mineralogical papers of broad interest to the geoscience and materials science community.