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July-August 2010

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I was very pleased to see the article “Gemstone Deposits in Turkey” in the March/April issue, but I am puzzled over the absence of any reference to jadeite. Many years ago I purchased a necklace for my wife of beads of lavender jadeite from Turkey. I also have a figure of a dolphin carved out of purple jadeite from Turkey. Unfortunately, I do not have the details of the locality, but I am quite certain that these items did indeed come from Turkey. The jadeite was identified by X-ray when I was with the Smithsonian Institution.

John S. White
Stewartstown, Pennsylvania

The first author replies: An unusual, possibly unique, deposit of purple jadeite has been found in the Bursa-Orhaneli region of northwestern Turkey, south-southeast of Istanbul. The jadeite occurs in an Ordovician (467 Ma) metagranitoid situated in a blueschist facies series of mica schists and marbles. The metagranitoid consists essentially of purple jadeite and quartz, with lesser amounts of chloritoid, lawsonite, glaucophane, and “phengite” micas.

Murat Hatipoglu
Buca-Izmir, Turkey


Two minor corrections need to be made to the article titled “A History of Mineral Collecting at the Chino Mine, Grant County, New Mexico,” which appeared in the November/December 2009 issue (pages 492–500). First, the name of the parent company of Chino Mines Company is Freeport McMoRan Copper & Gold, Inc. The “Inc.” was inadvertently omitted. Also, the introductory section needs a reference to the source of ranking of mine production given for Chino. As written, the article gives the impression that the information on the rank of the Chino mine among U.S. producers came from historic Phelps Dodge annual reports. In fact, the annual report gave only the amount of copper produced by the mine. Phelps Dodge never made such comparisons to their competitors; this information is from the U.S. Geological Survey website. I apologize for the errors, which were my responsibility and not that of my coauthors.

Robert M. North
Oro Valley, Arizona


I read with great pleasure Susan Robinson's recent article on my work. It articulated so well the complex intersections of art and science that are central to my practice. I'd like to acknowledge the contribution of Jamie Newman who, as manager of the mineralogical collection at the American Museum of Natural History, was so generous and instrumental in enabling me to work on my drawings of Clifford Frondel's specimens over a period of many months at the museum.

Barbara Siegel
New York, New York

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