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: FScPA-A3 _database_code_amcsd 0001085 9.8852 18.1574 5.3186 90 105.213 90 C2/m atom x y z occ Biso O1 .1108 .0864 .219 .8 O2 .1138 .1709 .724 .8 F .1008 0 .711 .8 O4 .3598 .2468 .788 .8 O5 .3535 .1388 .122 1.1 O6 .3447 .1140 .620 1.1 O7 .353 0 .291 1.2 SiT1 .2838 .0833 .304 .75 .4 AlT1 .2838 .0833 .304 .25 .4 SiT2 .2909 .1692 .8090 .75 .4 AlT2 .2909 .1692 .8090 .25 .4 MgM1 0 .0870 .5 .922 .6 ScM1 0 .0870 .5 .078 .6 MgM2 0 .1763 0 .597 .6 ScM2 0 .1763 0 .403 .6 MgM3 0 0 0 .6 CaM4 0 .2791 .5 .9 NaA .029 .5 .068 .5 2.3