Dravite Hawthorne F C, MacDonald D J, Burns P C American Mineralogist 78 (1993) 265-270 Reassignment of cation site occupancies in tourmaline: Al-Mg disorder in the crystal structure of dravite Locality: Osarar, Narok District, Kenya _database_code_amcsd 0001551 15.947 15.947 7.214 90 90 120 R3m atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) NaX 0 0 .15920 .814 .0227 .0227 .0177 .0114 0 0 KX 0 0 .15920 .014 .0227 .0227 .0177 .0114 0 0 CaX 0 0 .15920 .009 .0227 .0227 .0177 .0114 0 0 TiY .93867 .06133 .5643 .010 .0090 .0090 .0137 .0030 .0017 -.0017 CrY .93867 .06133 .5643 .002 .0090 .0090 .0137 .0030 .0017 -.0017 FeY .93867 .06133 .5643 .204 .0090 .0090 .0137 .0030 .0017 -.0017 MnY .93867 .06133 .5643 .001 .0090 .0090 .0137 .0030 .0017 -.0017 MgY .93867 .06133 .5643 .450 .0090 .0090 .0137 .0030 .0017 -.0017 AlY .93867 .06133 .5643 .334 .0090 .0090 .0137 .0030 .0017 -.0017 AlZ .73849 .70217 .5386 .846 .0073 .0069 .0069 .0035 -.0010 -.0002 MgZ .73849 .70217 .5386 .154 .0073 .0069 .0069 .0035 -.0010 -.0002 SiT .81018 .80835 .9280 .0056 .0054 .0069 .0025 .0006 .0004 B .11000 .89000 .3819 .0086 .0086 .0082 .0045 .0004 -.0004 OH1 0 0 .6989 .0128 .0128 .0118 .0064 0 0 O2 .06109 .93891 .4156 .0138 .0138 .0122 .0091 .0005 -.0005 OH3 .86947 .13053 .4381 .0139 .0139 .0071 .0017 -.0001 .0001 O4 .09300 .90601 .9989 .0101 .0101 .0115 .0019 -.0010 .0010 O5 .90733 .09267 .0212 .0097 .0097 .0106 .0017 -.0011 .0011 O6 .81568 .80578 .7059 .0119 .0110 .0074 .0063 .0012 .0008 O7 .71512 .71494 .0059 .0076 .0086 .0112 .0022 .0027 .0021 O8 .73016 .79077 .3674 .0098 .0062 .0159 .0038 -.0034 -.0017