Albite 



Anorthite 



23.1 



2.5 



23.1 



2.4 



154 Scientific Intelligence. 



Gulch, have been reported, however, from the Yukon District, 

 Canada. 



Samples of the recently reported "2-ton" mass of meteoric 

 iron found near Navajo, Arizona, which have reached the 

 National Museum show it to belong to the dense, nearly structure- 

 less varieties carrying but 5.81 per cent nickel, and provisionally 

 referred to the Nedagolla group. This puts to rest the early 

 supposition that the same might be a straggler from the Canyon 

 Diablo fall. 



A 54-pound mass of meteoric iron belonging to the octahedrite 

 group has been reported to the National Museum from Mount 

 Tabby, 20 miles northwest of Hannah P. 0., Utah. g. p. m. 



9. Feldspar Studies. — From Science Reports of the Tohoku 

 Imperial University, Series III, vol. 1, No. 1, pp. 1-32. Sendai, 

 Japan, 1921. X-ray analysis of Adularia and Moonstone and the 

 influence of temperature on the atomic arrangement of these min- 

 erals; by Shukustjke Kozu and Yoshitoshi Endo. — The two 

 feldspars investigated had the following compositions : 



Orthoclase 



Adularia, St. Gotthard 88.3 



Moonstone, Ceylon 74.4 



The adularia was shown to have a single space-lattice which 

 showed no variation over a wide range of temperature. The 

 moonstone showed a combination of two space-lattices which were 

 stable at 700° C. and lower temperatures, but as the temperature 

 was raised above this point the two lattices approached each other 

 until they became identical. The eight plates contain many 

 Laue-spot photographs. 



Optical, Chemical and Thermal Properties of Moonstone from 

 Korea; by Shukustjke Kozu and Masatoshi Suzuki. — This 

 material corresponded to the composition, 



Orthoclase . . 61.0 Albite 33.7 Anorthite . . 5-3 



The Laue-photograph showed also in this case double spots 

 indicating two intergrown space-lattices, although here they 

 appeared in the picture taken on the side pinacoid while with the 

 Ceylon moonstone they appeared on the base. The two lattices 

 merge into one on raising the temperature but at a lower point 

 than was the case with the Ceylon mineral. At the same time 

 the schillerization shown by the mineral disappeared, leading the 

 authors to assume that this property is in some way due to the 

 presence of two molecular lattices in the mineral. 



10. A Manual of Determinative Mineralogy with Tables; by 

 J. Volney Lewis. Third, Revised and Enlarged Edition. 298 

 pp. New York, 1921 (John Wiley and Sons). — The present 

 edition of this very useful book is at least twice the original size. 



