American Mineralogist
REGULAR ARTICLE
741 Sahamalite, a new rare earth carbonate mineral
755 Manganpyrosmalite and its polymorphic relation to friedelite and schallerite
761 New manganese oxides: hydrohausmannite and woodruffite
770 Thermal dehydration and x-ray studies on montmorillonite
784 In defense of the second decimal
794 X-ray investigation of colusite, germanite and reniérite
802 Investigation of thucholite
815 A method of effectively increasing the resolving power of a microscope to reveal unsuspected detail in thin sections
827 A spectrographic method for determining trace amounts of lead in zircon and other minerals
834 Crystallographic control of replacement of quartz by feldspar
840 Ilvaite and prehnite in micropegmatitic diorite, southeast Papua
845 A new occurrence of barium feldspar at Otjosondu, South West Africa, and an x ray method for determining the composition of hyalophane
860 A xonotlite occurrence in Puerto Rico
862 Cummingtonite from the Mikonui River, Westland, New Zealand
866 Tridymite and christensenite
868 Roentgenite, 3CeFCO3· 2CaCO3, a new mineral from Greenland
NOTES and NEWS
858 Notes and news: Genthelvite crystal from El Paso County, Colorado
BOOK REVIEW
874 Book reviews
PROCEEDINGS
872 Mineralogical Society (London)
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.