COL  ICSD Collection Code 9542
 DATE Recorded Jan 1, 1980; updated Jun 29, 1998
 NAME Potassium alumosilicate *
 MINR Microcline intermediate - from Kodarma pegmatite, Bihar, India
 MINR Feldspar group
 FORM K (Al Si3 O8)
      = Al K O8 Si3
 FORM K.85 Na.13 Ca.02 Al1.02 Si2.98 O8
 TITL Refinement of an intermediate microcline structure
 REF  American Mineralogist
      AMMIA 54 (1969) 1540-1545
 REF  Acta Crystallographica (1,1948-23,1967)
      ACCRA 8 (1955) 621-632
 AUT  Bailey S W
 CELL a=8.578 b=12.960 c=7.211 à=90.3 á=116.0 ç=89.1
      V=720.3 D=2.57 Z=4
 SGR  C -1          (2) - triclinic
 CLAS -1    (Hermann-Mauguin) - Ci  (Schoenflies)
 PRS  aC52
 ANX  ABC3X8
 PARM Atom__No OxStat  Wyck ---X--- ---Y--- ---Z---  -SOF-
      K      1  1.000    4i  0.2837 -0.0032  0.1378
      Al     1  3.000    4i  0.0095  0.1856  0.2214    0.58
      Al     2  3.000    4i  0.0095  0.8173  0.228     0.25
      Al     3  3.000    4i  0.7098  0.1189  0.3421    0.09
      Al     4  3.000    4i  0.7076  0.8833  0.3466    0.08
      Si     1  4.000    4i  0.0095  0.1856  0.2214    0.42
      Si     2  4.000    4i  0.0095  0.8173  0.228     0.75
      Si     3  4.000    4i  0.7098  0.1189  0.3421    0.91
      Si     4  4.000    4i  0.7076  0.8833  0.3466    0.92
      O      1 -2.000    4i  0.0005  0.1447 -0.0072
      O      2 -2.000    4i  0.6369  0.002   0.2857
      O      3 -2.000    4i  0.8238  0.1468  0.2239
      O      4 -2.000    4i  0.8279  0.8545  0.2331
      O      5 -2.000    4i  0.035   0.3153  0.2549
      O      6 -2.000    4i  0.0366  0.6914  0.2635
      O      7 -2.000    4i  0.1842  0.1245  0.4065
      O      8 -2.000    4i  0.1777  0.8741  0.4095
 WYCK i13
 ITF  K   1   B=1.48(2)
 ITF  Al  1   B=0.41(2)
 ITF  Al  2   B=0.43(2)
 ITF  Al  3   B=0.40(2)
 ITF  Al  4   B=0.41(2)
 ITF  Si  1   B=0.41(2)
 ITF  Si  2   B=0.43(2)
 ITF  Si  3   B=0.40(2)
 ITF  Si  4   B=0.41(2)
 ITF  O   1   B=1.15(7)
 ITF  O   2   B=0.90(6)
 ITF  O   3   B=1.36(7)
 ITF  O   4   B=1.30(7)
 ITF  O   5   B=0.86(6)
 ITF  O   6   B=1.01(7)
 ITF  O   7   B=1.03(7)
 ITF  O   8   B=1.01(7)
 REM  M PDF 19-932, mean T-O: 1.694, 1.642, 1.618, 1.616, 
      R(anisotropic)=0.08
 RVAL 0.092
 TEST Calculated density unusual but tolerable. (Code 23)