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