Jahnsite-(NaFeMg) Kampf A R, Steele I M, Loomis T A American Mineralogist 93 (2008) 940-945 Jahnsite-(NaFeMg), a new mineral from the Tip Top mine, Custer County, South Dakota: Description and crystal structure Locality: Tip Top mine, Custer County, South Dakota _database_code_amcsd 0004587 15.0811 7.1403 9.8299 90 110.445 90 P2/a atom x y z Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Na 1/4 .9701 0 .0203 .0204 .0136 .0204 0 -.0012 0 Fe1 1/4 .4713 0 .0083 .0067 .0096 .0088 0 .0031 0 Mg1 1/2 0 1/2 .0125 .0131 .0116 .0116 -.0004 .0027 -.0024 Mg2 1/4 .5057 1/2 .0111 .0124 .0120 .0088 0 .0034 0 Fe2 0 0 0 .0084 .0095 .0062 .0098 -.0000 .0037 -.0006 Fe3 0 1/2 0 .0085 .0080 .0072 .0104 .0001 .0036 .0007 P1 .1870 .2677 .1856 .0089 .0082 .0094 .0085 -.0003 .0023 -.0009 P2 .0800 .7419 .7963 .0093 .0089 .0100 .0091 .0012 .0034 .0007 O1 .2789 .2510 .1489 .0157 .009 .021 .018 .005 .005 .004 O2 .2082 .3103 .3435 .0187 .023 .020 .014 .001 .007 -.001 O3 .1264 .0929 .1411 .0176 .016 .013 .019 -.005 .000 -.001 O4 .1405 .4378 .0810 .0120 .009 .014 .013 .001 .004 .003 O5 .1837 .6682 .8599 .0165 .010 .022 .017 .004 .004 .004 O6 .0574 .7822 .6364 .0149 .020 .013 .011 .001 .005 .003 O7 .0750 .9217 .8777 .0166 .021 .014 .019 -.002 .012 -.003 O8 .0126 .5928 .8173 .0133 .013 .012 .015 -.001 .006 .002 Oh .0274 .7509 .0992 .0140 .017 .010 .017 .001 .008 -.002 OW1 .2272 .7264 .3420 .0270 .033 .027 .025 .010 .015 .006 OW2 .4484 .2126 .3482 .0298 .034 .022 .020 -.003 -.006 .003 OW3 .6269 .9869 .4565 .0285 .024 .026 .039 -.001 .016 -.005 OW4 .3907 .5152 .5161 .0211 .017 .022 .024 -.002 .007 .006 HOh .996 .749 .162 .050 H1a .258 .717 .278 .05 H1b .167 .748 .293 .050 H2a .434 .298 .405 .050 H2b .395 .201 .269 .05 H3a .618 .046 .371 .05 H3b .659 .884 .452 .050 H4a .416 .605 .478 .050 H4b .425 .491 .606 .050