Spinel Lenaz D, Youbi N, Min A D, Boumehdi M A, Abbou M B American Mineralogist 99 (2014) 267-275 Low intra-crystalline closure temperatures of Cr-bearing spinels from the mantle xenoliths of the Middle AtlasNeogene-Quaternary Volcanic Field (Morocco):Mineralogical evidence of a cooler mantle beneath the West African Craton. Note:Sample MAR-BI4 Locality:Middle Atlas Neogene-Quaternary Volcanic Field of Morocco _database_code_amcsd 0020062 8.1454 8.1454 8.1454 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) MgT .125 .125 .125 .75 .0070 .0070 .0070 .0070 0 0 0 FeT .125 .125 .125 .25 .0070 .0070 .0070 .0070 0 0 0 AlM .5 .5 .5 .80 .0057 .0057 .0057 .0057 -.00048 -.00048 -.00048 CrM .5 .5 .5 .20 .0057 .0057 .0057 .0057 -.00048 -.00048 -.00048 O .26283 .26283 .26283 .0081 .0081 .0081 .0081 .0000 .0000 .0000