American Mineralogist

Volume 57, Issue no. 1112 : November - December 1972

REGULAR ARTICLE

1571 Smythite, (Fe,Ni)9S11 – A redefinition

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1578 Correlations between Si-O bond length, Si-O-Si angle and bond overlap populations calculated using extended Huckel molecular orbital theory

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1614 The effect of tetrahedral angles on Si-O bond overlap populations for isolated tetrahedra

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1643 Variation of Si-O distances in olivines, soda melilite and sodium metasilicate as predicted by semi-empirical molecular orbital calculations

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1664 Microstructural investigation of ballas diamond

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1681 Crystallographic study of rashleighite a member of the turquoise group

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1692 Interpretation of the spin-allowed bands of Fe2+ in silicate garnets

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1711 Refinement of the crystal structure of a volcanic nepheline

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1720 Crystal structure of a rubidium iron feldspar

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1729 Spinels and the petrogenesis of some Apollo 12 igneous rocks

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1748 Composition of perovskite in kimberlite

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1754 The heat capacities at low temperatures and entropies at 298.15K of huntite, CaMg3(CO3)4, and artinite Mg2(OH)2CO3·3H2O

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1768 The heat capacities at low-temperatures and entropies at 298.15K of nesquehonite, MgCO3·3H2O, and hydromagnesite

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1782 Retrieval of thermodynamic data from a study of inter-crystalline and intracrystalline ion-exchange equilibrium

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1801 Leucosphenite, and its occurrence in the Green River formation of Utah and Wyoming

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1823 Cation exchange selectivity in mica and vermiculite

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1832 Cation and layer charge effects on blister-like osmotic swelling of micaceous vermiculite

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1849 Laboratory dissolution of plagioclase feldspars in water and organic acids at room temperature

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1860 Chemical changes in plagioclases and their bearing on the petrologic history of an amphibolite body

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1873 Crystallography of a high-temperature phase of realgar

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1880 The crystal structure of tilasite

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1884 Development of (120) prism faces of natural topaz

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1889 Tremolite with high richterite-molecule content in kimberlite from Buell Park, Arizona

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1894 Phase stability in the ThGeO4 system over the range 750-1450°C at 1 atm

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1899 Use of mercuric bromide as a heavy liquid

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1902 The effect of reduced water fugacity on the buffering of oxygen fugacity, in hydrothermal experiments

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NEW MINERAL NAMES

1876 New observations on natural pyrrhotites: Part II. Laminar magnetite in monoclinic pyrrhotite

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1909 New Mineral Names

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MINERALOGICAL NOTES

1871 MINERALOGICAL NOTES A repeated twin in natural diamond from Tortiya, Ivory Coast

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BOOK REVIEW

1915 Book Reviews

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INDEX

1926 Index to Volume 57

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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.