Orthoclase Phillips M W, Ribbe P H American Mineralogist 58 (1973) 263-270 The structures of monoclinic potassium-rich feldspars Note: variety adularia Locality: St. Gotthard, Switzerland _database_code_amcsd 0000313 8.545 12.967 7.201 90 116.00 90 C2/m atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Si1 .0093 .1842 .2243 .60 .0041 .0013 .0050 -.0003 .0022 -.0003 Al1 .0093 .1842 .2243 .40 .0041 .0013 .0050 -.0003 .0022 -.0003 Si2 .7078 .1176 .3445 .89 .0033 .0009 .0049 0 .0018 .0002 Al2 .7078 .1176 .3445 .11 .0033 .0009 .0049 0 .0018 .0002 K .2834 0 .1372 .88 .0065 .0036 .0128 0 .0030 0 Na .2834 0 .1372 .12 .0065 .0036 .0128 0 .0030 0 OA(1) 0 .1447 0 .0081 .0021 .0115 0 .0049 0 OA(2) .6339 0 .2848 .0065 .0014 .0096 0 .0017 0 OB .8262 .1449 .2280 .0077 .0033 .0125 -.0005 .0063 .0002 OC .0339 .3117 .2585 .0057 .0018 .0095 -.0006 .0026 -.0006 OD .1821 .1257 .4070 .0069 .0020 .0071 .0001 .0019 .0004