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^[[M&P
1959]]

11

Investigation and Research

Curator G. Switzer completed the annual review of the diamond industry, and continued work on a long term research project dealing with the sulfate and related minerals. Other minerals under investigation by him are paradamite from Mapimi, Mexico, fornacite from Tiger, Ariz., and hambergite from San Diego County, Calif.

Associate Curator E. P. Henderson completed a study of the Jalandhar meteorite, an iron meteorite reported to have fallen in India in 1621 and made into a knife and given to Emperor Jahangir. Other work in progress includes a study of the geographic distribution of hexahedrites, investiation of the metallic inclusions in iron meteorites, study of the morphology of meteorites, and descriptions of several unstudied or incorrectly described meteorites in the collection.

Associate curator Paul E. Desautels continued a long range research project on the lead oxychloride minerals from Laurium, Greece, and began work on the description of a new Mexican locality of the rare mineral legrandite.

Associate Curator Roy S. Clarke, Jr., completed chemical analyses of the Casas Grande, Grant, and Boaz meteorites, and continued work on two long term projects, a study of the solubility relationships in the four component equilibrium system Na20-Ca0B203-H20, and a study of methods of chemical analysis for stony and iron meteorites. In addition he is making chemical analyses of several minerals for other members of the division.