American Mineralogist
REGULAR ARTICLE
935 Ameghinite, Na2O·3B2O3·4H2O, a. new borate from Argentina
946 A study of polytypism in silicon carbide
974 Ordering of tetrahedral aluminum in prehnite, Ca2(Al,Fe3+)[Si3AlO10](OH)2
985 Structural and chemical effects on the SiKα X-ray line for silicates
994 Cleavage in pyrite
1003 Origin of coloration in some fluorites
1009 Determination of cation distribution in the cummingtonite-grunerite series by Mössbauer spectra
1027 Mackinawite from South Africa
1036 Properties of a synthetic magnesium-aluminum carbonate hydroxide and its relation ship to magnesium-aluminum double hydroxide, manasseite and hydrotalcite
1048 Ezcurrite, 2Na2O·5B2O3·7H2O: A restudy
1060 Reexamination of bermanite
1067 Descloizite, mottramite, and vanadinite from South West Africa: an infrared and X-ray study
1077 Syntheses of lead silicates: larsenite, barysilite and related phases
1085 New data on kentrolite and melanotekite: ternary phase relations in the system PbO-Fe2O3-SiO2
1094 A study of chevkinite arid perrierite
1105 New synthetic hydrogarnets
1110 Micas of the Brown Derby pegmatites, Gunnison County, Colorado
1122 The trioctahedral brittle micas
1129 X-ray and chemical study of weathering glauconite
1139 Element distribution among coexisting phases in the system MgO-FeO-Fe2O3-SiO2 as a function of temperature and oxygen fugacity
1153 Oxygen, carbon dioxide, and sulfur fugacities during diagenesis and low-grade metamorphism of late Precambrian subgraywackes from northern Utah
1161 Experimental formation of kaolinite from montmorillonite at low temperatures
1174 Shear strength and weakening of zeolitized tuffs from the Nevada Test Site, Nevada
1179 Carbonatitic barites
1190 Secondary minerals produced by weathering of the Wolf Creek meteorite
1206 Si-O absorption band near 1000 cm-1 and OH absorption bands of chlorite
1211 Growth of bromellite crystals
1214 Cocinerite discredited
1216 Dawsonite in the Greta coal measures at Muswellbrook, New South Wales
1220 X-ray diffraction data of aluminocopiapite
1224 Austinite from Gold Hill, Utah
1226 On leucophoenicites: I. A note on form developments
1233 The thermal stability of purified tridymite
1240 An occurrence of cordierite-garnet gneiss in Georgia
1243 Reducing preferred orientation in diffractometer samples
1247 The effect of surface properties on refractive index determination by the Brewster angle method
1250 A micro method for determination of cation exchange capacity of clays by infrared spectroscopy
NEW MINERAL NAMES
1253 New Mineral Names
MINERALOGICAL NOTES
1198 MINERALOGICAL NOTES: An infrared absorption analysis of magnetite
NOTES
1259 Notices
BOOK REVIEW
1255 Book Reviews
MEMORIAL
957 Memory effect in single-crystal transformations of aragonite-type to calcite-type potassium nitrate
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.