American Mineralogist
REGULAR ARTICLE
595 Origin of shapes of quartz sand grains
607 “Cryptomelane, a new name for the commonest of the “”psilomelane”” minerals”
611 The unit cell of cryptomelane
614 Composition, specific gravity and refractive indices of rhodochrosite; rhodochrosite from Butte, Montana
629 Magnetic separations in petrography
638 Zoisite-prehnite alteration of gabbro
646 Idiomorphic cordierite from Safe Harbor, Pennsylvania
649 An unusual asymmetrically banded fissure vein: A discussion
652 Fellowships available in mineralogy and structural crystallography; Nominations for officers of the Mineralogical Society of America for 1943; Announcement of annual meeting
653 Discredited minerals
TABLE OF CONTENTS
&
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.