American Mineralogist
MSA PRESIDENTIAL ADDRESS
443 PRESIDENTIAL ADDRESS The ionic model: Perceptions and realities in mineralogy
REGULAR ARTICLE
464 ARTICLES A high-temperature study of the low-high leucite phase transition using the transmission electron microscope
477 Crystal-structure determinations of synthetic sodium, magnesium, and potassium birnessite using TEM and the Rietveld method
490 Characterization of Cu in lithiophorite from a banded Mn ore
495 Modulated microstructures in calcian ankerite
501 Crystal structure of boggsite, a new high-silica zeolite with the first three-dimensional channel system bounded by both 12- and 10-rings
508 Crystal chemistry of the natural vanadium bronzes
522 Crystal structures of a natural and a Cs-exchanged clinoptilolite
529 Ion exchange reactions between dehydroxylated micas and salt melts and the crystal chemistry of the interlayer cation in micas
539 Application of the Darken equation to mineral solid solutions with variable degrees of order-disorder
544 Ternary feldspar experiments and thermodynamic models
560 Reaction relations in the granite system: Implications for trachytic and syenitic magmas
572 Geochemical evolution of the Maloin Ranch pluton, Laramie Anorthosite Complex, Wyoming: Trace elements and petrogenetic models
589 Högbomite from the Prince Olav Coast, East Antarctica: An example of oxidation – exsolution of a complex magnetite solid solution?
601 Activity diagrams for clinoptilolite: Susceptibility of this zeolite to further diagenetic reactions
620 Fe-rich pyroxenes from a microdiorite dike, Whangarei, New Zealand
631 Relations of zoned pegmatites to other pegmatites, granite, and metamorphic rocks in the southern Black Hills, South Dakota
656 Mössbauer spectra of biotite from metapelites
667 High-pressure DTA study of the upper three-phase region in the system Na2CO3-H2O
676 Yoshiokaite, a new Ca,Al-silicate mineral from the Moon
687 Low temperature alteration of REE-rich chlorapatite from the Stillwater Complex, Montana
694 Wilkinsonite, Na2Fe2+4Fe3+2Si6O20, a new member of the aenigmatite group from the Warrumbungle Volcano, New South Wales, Australia
702 Kegelite from Tsumeb, Namibia: A redefinition
705 Baumite discredited
715 Acceptance of the Roebling Medal of the Mineralogical Society of America for 1989
719 Acceptance of the Mineralogical Society of America Award for 1989
AWARD
714 PRESENTATION OF AWARDS FOR 1989 Presentation of the Roebling Medal of the Mineralogical Society of America for 1989 to Helen D. Megaw
718 Presentation of the Mineralogical Society of America Award for 1989 to Michael A. Carpenter
NEW MINERAL NAMES
706 NEW MINERAL NAMES
BOOK REVIEW
721 BOOK REVIEWS
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.