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: FPA-BUL
_database_code_amcsd 0001082
9.8277 17.930 5.2931 90 105.168 90 C2/m
atom     x     y    z occ Biso
O1    .119 .0868 .216       .8
O2    .116 .1676 .740       .8
F3    .106     0 .711       .8
O4    .366 .2522 .782       .8
O5    .357 .1380 .126      1.1
O6    .341 .1091 .631      1.1
O7    .348     0 .286      1.2
SiT1 .2821 .0831 .309 .75   .4
AlT1 .2821 .0831 .309 .25   .4
SiT2 .2953 .1721 .809 .75   .4
AlT2 .2953 .1721 .809 .25   .4
MgM1     0 .0888   .5  .8   .6
AlM1     0 .0888   .5  .2   .6
MgM2     0 .1775    0  .8   .6
AlM2     0 .1775    0  .2   .6
MgM3     0     0    0  .8   .6
AlM3     0     0    0  .2   .6
CaM4     0 .2768   .5       .9
NaA   .024    .5 .057  .5  2.3