Zircon Finch R J, Hanchar J M, Hoskin P W O, Burns P C American Mineralogist 86 (2001) 681-689 Rare-earth elements in synthetic zircon: Part 2. A single-crystal X-ray study of xenotime substitution Sample: Gd+P (30) _database_code_amcsd 0002647 6.6213 6.6213 5.9879 90 90 90 *I4_1/amd 0 -.25 .125 atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Si 0 .75 5/8 Zr 0 .75 1/8 O 0 .0660 .1959 .008 .006 .005 0 0 .000