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Martin Engi is absolutely correct, although I would say that the 
effect can go out even farther (50-60 Ám or so). X-ray maps of Ti in 
garnet that contain numerous rutile or ilmenite inclusions can show 
very misleading patterns.

Happy hunting,

Frank

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Frank Spear
Professor and Chair
Department of Earth and Environmental Sciences, JRSC 1C25
Rensselaer Polytechnic Institute
110 8th Street
Troy, New York 12180-3590
Phone (office): 518-276-6103
           (lab)     : 518-276-4899
Fax:                  518-276-6680
http://ees2.geo.rpi.edu/spear/spear.html