American Mineralogist
REGULAR ARTICLE
1 Sigloite, a new mineral from Llallagua, Bolivia
9 Spencite, the yttrium analogue of tritomite from Sussex County, New Jersey
26 Properties and paragenesis of coffinite from the Woodrow mine, New Mexico
34 A scheme for recalculating the chemical analyses of argillaceous rocks for comparative purposes
47 Studies of the manganese oxides. V. Ramsdellite, MnO2, an orthorhombic dimorph of pyrolusite
59 Zinc-bearing todorokite from Philipsburg, Montana
67 Beryllium-fluorine mineralization at Aguachile Mountain, Coahuila, Mexico
75 Synthetic fluor-magnesio-richterite
83 Hydroxyl ion catalysis of the crystallization of amorphous silica at 330° C. and some observations on the hydrolysis of albite solutions
90 Metastable osumilite- and petalite-type phases in the system MgO-Al2O3-SiO2
105 Measurement of the metal content of naturally occurring, metal-deficient, hexagonal pyrrhotite by an x-ray spacing method
112 Sulfate studies II. Solid solution between alunite and jarosite
127 Isomorphous substitution in natural and synthetic alunite
137 Beidellite
147 Grossularite-spessartite garnet from the Victory mine, Gabbs, Nevada
156 The thermal transformation of pyrophyllite to mullite
157 Lazulite from Yukon, Canada
160 Hornblende-cummingtonite intergrowths
163 Alluaudite and caryinite
165 Adsorption of dyes by clay minerals
170 The Mg and Fe2+ contents of pyroxenes from the Pennsylvania and Delaware Piedmont province: A re-interpretation
177 International Mineralogical Association, 3d General Congress Program
185 Abstracts
NEW MINERAL NAMES
172 New Mineral Names
NOTES
176 Notices
NOTES and NEWS
152 Notes and News: Oriented growths of cryptomelane in sylvite, Carlsbad, New Mexico
BOOK REVIEW
175 Book Reviews
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.