Pargasite Raudsepp M, Turnock A C, Hawthorne F C, Sherriff B L, Hartman J S American Mineralogist 72 (1987) 580-593 Characterization of synthetic pargasitic amphiboles (NaCa2Mg4M3+Si6Al2O22(OH,F)2; M3+ = Al,Cr,Ga,Sc,In) by infrared spectroscopy, Rietveld structure refinement, and 27Al, 29Si, and 19F MAS NMR spectroscopy Sample: ScPA-A5 _database_code_amcsd 0001081 9.9405 18.094 5.2986 90 105.364 90 C2/m atom x y z occ Biso O1 .117 .0935 .233 .8 O2 .108 .1741 .712 .8 OH3 .109 0 .713 .8 O4 .352 .2495 .770 .8 O5 .354 .1401 .119 1.1 O6 .344 .1091 .638 1.1 O7 .348 0 .290 1.2 SiT1 .2824 .0820 .303 .75 .4 AlT1 .2824 .0820 .303 .25 .4 SiT2 .288 .1682 .811 .75 .4 AlT2 .288 .1682 .811 .25 .4 MgM1 0 .0865 .5 .6 MgM2 0 .1751 0 .789 .6 ScM2 0 .1751 0 .211 .6 MgM3 0 0 0 .792 .6 ScM3 0 0 0 .208 .6 CaM4 0 .2811 .5 .9 NaA 0 .5 0 2.3