Eakerite
Kossiakoff A A, Leavens P B
American Mineralogist 61 (1976) 956-962
The crystal structure of eakerite, a calcium-tin silicate
Note: z-coordinate of Si2 altered
_database_code_amcsd 0000529
15.892 7.721 7.438 90 101.34 90 P2_1/a
atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Sn 0 0 0 .0078 .0082 .0089 .0004 .0012 .0027
Ca .3005 .3111 .0021 .0092 .0109 .0100 -.0005 .0023 -.0005
Al .2708 .0220 -.3172 .0055 .0059 .0065 .0001 .0014 .0002
Si1 .4554 .1697 .7132 .0043 .0060 .0062 -.0001 .0018 -.0007
Si2 .1661 .1445 .3091 .0054 .0063 .0055 .0004 .0006 .0001
Si3 .4932 .2181 .3349 .0037 .0071 .0051 .0002 .0011 .0007
O1 .0197 .1993 -.1614 .0096 .0140 .0134 .0021 .0026 .0035
O2 .5051 -.0164 -.2694 .0153 .0039 .0237 .0025 .0035 -.0007
O3 .2143 .3083 .2372 .0111 .0135 .0101 -.0011 .0032 -.0032
O4 .1225 .0234 .1411 .0156 .0096 .0099 .0014 .0024 -.0027
O5 .3625 .1448 -.2316 .0082 .0143 .0109 -.0015 .0028 -.0024
O6 .4470 .3340 .1645 .0086 .0104 .0129 .0002 -.0014 .0005
O7 .2362 .0349 .4488 .0092 .0131 .0133 .0015 .0014 .0001
Wat8 .3193 .0030 .1531 .0154 .0179 .0166 .0010 -.0011 -.0012
OH9 .2017 .1031 -.1811 .0097 .0154 .0122 .0026 .0021 .0011
O10 .4397 .2281 .4977 .0102 .0191 .0091 .0001 .0028 .0001
O11 .0922 .2216 .4124 .0110 .0153 .0124 .0036 .0029 -.0008
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Eakerite
Uchida H, Downs R T, Thompson R M
Acta Crystallographica E63 (2007) i47-i49
Reinvestigation of eakerite, Ca2SnAl2Si6O18(OH)2*2H2O: H-atom positions by
single-crystal X-ray diffraction and correlation with Raman spectroscopic data
Locality: Foote Mineral Company mine, Kings Mountain, North Carolina, USA
_database_code_amcsd 0010472
15.8202 7.6963 7.4449 90 101.293 90 P2_1/a
atom x y z Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Sn 0 0 0 .00651 .00652 .00640 .00631 -.00026 .00054 .00031
Ca .300365 .31104 .00225 .00876 .00858 .00888 .00905 -.00034 .00227 -.00044
Al .27068 .02215 .68283 .00660 .00669 .00700 .00594 .00023 .00081 .00031
Si1 .45531 .16988 .71316 .00629 .00629 .00606 .00660 -.00021 .00144 -.00056
Si2 .16629 .14507 .30892 .00636 .00589 .00666 .00618 .00003 .00030 .00033
Si3 .49337 .21803 .33559 .00616 .00625 .00615 .00606 .00018 .00114 .00105
O1 .01960 .19958 -.16104 .01086 .0092 .0108 .0128 -.0021 .0026 -.0054
O2 .50547 -.01656 .72868 .0129 .0121 .0068 .0190 .0018 .0009 -.0015
O3 .21455 .30912 .23632 .00992 .0126 .0072 .0104 .0021 .0035 .0010
O4 .12298 .02274 .14054 .00820 .0073 .0089 .0077 -.0004 -.0005 .0025
O5 .36271 .14553 -.23084 .00947 .0078 .0111 .0101 -.0028 .0030 -.0016
O6 .44680 .33291 .16450 .00886 .0085 .0098 .0077 -.0001 .0002 .0035
O7 .23642 .03515 .44934 .01008 .0098 .0120 .0076 -.0023 -.0005 -.0009
O8 .31937 .00282 .1518 .0146 .0095 .0180 .0157 -.0009 .0012 .0001
O9 .20206 .10401 -.18049 .01123 .0075 .0146 .0117 .0013 .0020 -.0014
O10 .43954 .22846 .49792 .0120 .0105 .0186 .0076 .0010 .0035 .0019
O11 .09213 .22090 .41285 .01080 .0078 .0147 .0097 -.0024 .0011 .0024
H81 .316 .002 .239 .067
H82 .363 -.025 .140 .029
H9 .150 .116 -.204 .046
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