Weeksite
Stohl F V, Smith D K
American Mineralogist 66 (1981) 610-625
The crystal chemistry of the uranyl silicate minerals
Locality: Anderson mine, Yavapai County, Arizona, USA
_database_code_amcsd 0000839
7.106 17.900 7.087 90 90 90 Amm2
atom x y z
U1 0 .198 0
Si 0 .130 .523
O1 .25 .307 .546
O2 0 .180 .693
O2b 0 .180 .307
O3 .194 .071 .487
O4 0 .429 .473
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Weeksite
Fejfarova K, Plasil J, Yang H, Cejka J, Dusek M, Downs R T, Barkley M C, Skoda R
American Mineralogist 97 (2012) 750-754
Revision of the crystal structure and chemical formula of weeksite,
K2(UO2)2(Si5O13)*4H2O
Locality: Anderson mine, Arizona, USA
_database_code_amcsd 0018760
14.1957 14.2291 9.6305 90 111.578 90 C2/m
atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
U1 .099331 .246786 .89678 .01189 .00807 .01867 .00959 .00057 .00403 .00072
K1 -.0707 0 .8602 .951 .0369 .0280 .0310 .057 0 .0224 0
K2 .2460 0 .8433 .930 .054 .058 .040 .089 0 .055 0
Si1 0 .3068 .5 .0166 .0133 .0244 .0121 0 .0046 0
Si2 .18748 .24984 .2495 .0116 .0094 .0180 .0080 .0011 .0038 -.0010
Si3 .29855 .10998 .5004 .0184 .0220 .0156 .0192 -.0011 .0095 .0000
O1 .4105 .1224 .4996 .033 .020 .030 .052 -.005 .018 -.002
O2 .0712 .2440 .1370 .023 .006 .055 .007 .000 .001 -.001
O3 .2472 .2551 .1367 .024 .009 .055 .009 .000 .005 -.001
O4 .0366 .2437 .6473 .023 .024 .037 .008 .003 .006 .006
O5 .2162 .1560 .3546 .027 .028 .026 .021 -.001 .002 .011
O6 .2705 0 .4998 .022 .029 .012 .029 0 .013 0
O7 .2892 .1573 .6467 .026 .036 .018 .027 -.003 .016 -.007
O8 .1020 .1201 .9055 .029 .035 .019 .040 -.001 .021 .001
O9 .0990 .3727 .8972 .032 .036 .020 .042 -.003 .016 -.003
Wat10 .4310 0 .8411 .053 .033 .040 .073 0 .005 0
Wat11 -.2624 0 .8441 .98 .059 .059 .052 .073 0 .034 0
Wat12 0 0 .5 .72 .036
Wat13 0 -.079 .5 .259 .036
Wat14 -.0464 -.0614 .602 .281 .036
Wat15 -.0917 -.0636 .398 .264 .036
Wat16 -.445 0 .702 .24 .024
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Weeksite
Jackson J M, Burns P C
The Canadian Mineralogist 39 (2001) 187-195
A re-evaluation of the structure of weeksite, a uranyl silicate
framework mineral
_database_code_amcsd 0005712
14.209 14.248 35.869 90 90 90 Cmmb
atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
U(1) 1/4 .2543 .15016 .0133 .0094 .0181 .0124 0 0 -.0018
U(2) 1/4 .2545 .34843 .0189 .0141 .0317 .0108 0 0 -.0041
U(3) 0 1/4 .40027 .0219 .0152 .0405 .0099 .0009 0 0
U(4) 0 1/4 .09875 .0139 .0098 .0179 .0141 -.0006 0 0
Si(1) 1/4 .1937 .2496 .0050
Si(2) .0487 .1100 .2491 .0072
Si(3) 1/4 .2517 .4371 .0233
Si(4) 1/4 .2494 .0627 .0112
Si(5) 0 1/4 .1863 .0164
Si(6) 0 1/4 .3117 .0186
Si(7) 0 .190 0 .5 .0196
Si(8) -.2031 .1102 .0001 .5 .0209
Si(9) 0 .193 1/2 .5 .0350
Si(10) .201 .110 .5000 .5 .0343
K(1) .0888 1/2 .1602 .02 .0373 .0184 .0392 .0544 0 .0007 0
Ca(1) .0888 1/2 .1602 .12 .0373 .0184 .0392 .0544 0 .0007 0
Ba(1) .0888 1/2 .1602 .25 .0373 .0184 .0392 .0544 0 .0007 0
Wat(1) .0888 1/2 .1602 .23 .0373 .0184 .0392 .0544 0 .0007 0
K(2) .9114 0 .3376 .02 .0445 .0274 .0437 .0623 0 .0065 0
Ca(2) .9114 0 .3376 .12 .0445 .0274 .0437 .0623 0 .0065 0
Ba(2) .9114 0 .3376 .25 .0445 .0274 .0437 .0623 0 .0065 0
Wat(2) .9114 0 .3376 .33 .0445 .0274 .0437 .0623 0 .0065 0
K(3) .160 0 .4161 .62 .0638 .0529 .0531 .0854 0 -.0397 0
K(4) .841 0 .4092 .56 .0406 .0462 .0328 .0429 0 .0020 0
K(5) .159 1/2 .0890 .62 .0402 .0195 .0293 .0718 0 -.0020 0
K(6) .157 0 .0836 .64 .0634 .0705 .0329 .0869 0 .0210 0
O(1) 1/4 .261 .2132 .0279
O(2) 0 1/4 -.0369 .0260
O(3) 1/4 .258 .2858 .0258
O(4) 0 1/4 .4626 .0434
O(5) -.162 .248 .0898 .0244
O(6) .1605 .1228 .2489 .0159
O(7) -.089 .754 .1576 .0250
O(8) .088 .260 .3408 .0222
O(9) .002 .159 .2134 .0251
O(10) .004 .154 .2866 .0386
O(11) 1/4 .160 .4632 .0350
O(12) .161 .250 .4089 .0294
O(13) 1/4 .381 .1463 .0146
O(14) 1/4 .383 .3503 .0367
O(15) .000 .126 .0993 .0314
O(16) 1/4 .129 .1499 .0202
O(17) 1/4 .126 .3465 .0505
O(18) -.001 .124 .3994 .0371
O(19) .025 0 .2491 .0101
O(20) 1/4 .157 .0364 .0250
O(21) -1/4 .158 .0361 .0192
O(22) 1/4 .341 .4633 .0467
O(23) 1/4 0 .498 .0675
O(24) -1/4 0 .002 .0687
O(25) -.091 .119 .000 .5 .0301
O(26) .090 .126 .500 .5 .0550
Wat(27) -.106 1/2 .168 .0140
Wat(28) 1/4 1/2 .249 .3121
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Weeksite
Baturin S V
Doklady Akademii Nauk SSSR 282 (1985) 1132-1136
Crystal-structure of weeksite
_database_code_amcsd 0018510
7.092 17.888 7.113 90 90 90 Cmmm
atom x y z occ Biso
U 0 .1982 0 1.15
Si1 0 .3744 0 1.1
Si2 0 0 .117 .5 1.0
Si3 .095 .5 .282 .5 1.1
O1 0 .199 .248 1.1
O2 .174 .316 0 1.3
O3 0 .427 .190 2.4
O4 0 .071 0 11.0
O5 0 .5 .5 2.9
O6 .179 0 .268 .5 2.8
Wat1 0 0 .5 6.4
Wat2 .179 .325 .5 .50 3.8
K .179 .325 .5 .31 3.8
Na .179 .325 .5 .19 3.8
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