Biotite Brigatti M F, Galli E, Poppi L American Mineralogist 76 (1991) 1174-1183 Effect of Ti substitution in biotite-M crystal chemistry Sample 10 from a lamproite rock, Fortuna, Spain _database_code_amcsd 0001382 5.322 9.228 10.102 90 100.25 90 C2/m atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Si .0743 .1670 .2232 .733 .0067 .0020 .0040 -.0001 .0008 -.0001 Al .0743 .1670 .2232 .267 .0067 .0020 .0040 -.0001 .0008 -.0001 K 0 .5 0 .958 .0235 .0070 .0075 0 .0019 0 Ca 0 .5 0 .004 .0235 .0070 .0075 0 .0019 0 Na 0 .5 0 .016 .0235 .0070 .0075 0 .0019 0 Mg1 0 0 .5 .534 .0081 .0022 .0050 0 .0013 0 Al1 0 0 .5 .031 .0081 .0022 .0050 0 .0013 0 Cr1 0 0 .5 .018 .0081 .0022 .0050 0 .0013 0 Fe1 0 0 .5 .196 .0081 .0022 .0050 0 .0013 0 Mn1 0 0 .5 .010 .0081 .0022 .0050 0 .0013 0 Ti1 0 0 .5 .174 .0081 .0022 .0050 0 .0013 0 Mg2 0 .3353 .5 .534 .0071 .0038 .0044 0 .0013 0 Al2 0 .3353 .5 .031 .0071 .0038 .0044 0 .0013 0 Cr2 0 .3353 .5 .018 .0071 .0038 .0044 0 .0013 0 Fe2 0 .3353 .5 .196 .0071 .0038 .0044 0 .0013 0 Mn2 0 .3353 .5 .010 .0071 .0038 .0044 0 .0013 0 Ti2 0 .3353 .5 .174 .0071 .0038 .0044 0 .0013 0 O1 .0291 0 .1673 .0246 .0034 .0047 0 .0002 0 O2 .3187 .2368 .1663 .0149 .0064 .0039 -.0020 .0005 -.0003 O3 .1321 .1687 .3907 .0100 .0022 .0042 -.0004 .0009 -.0001 O4 .1308 .5 .4007 .0065 .0030 .0045 0 .0026 0