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: FGaPA-A3
_database_code_amcsd 0001084
9.8600 17.9685 5.3027 90 105.198 90 C2/m
atom     x     y    z  occ Biso
O1    .118 .0896 .221        .8
O2    .106 .1703 .730        .8
F3    .101     0 .709        .8
O4    .359 .2487 .790        .8
O5    .350 .1377 .116       1.1
O6    .346 .1093 .615       1.1
O7    .344     0 .278       1.2
SiT1 .2844 .0842 .307  .75   .4
AlT1 .2844 .0842 .307  .25   .4
SiT2 .2893 .1707 .809  .75   .4
AlT2 .2893 .1707 .809  .25   .4
MgM1     0 .0875   .5        .6
MgM2     0 .1749    0   .9   .6
GaM2     0 .1749    0   .1   .6
MgM3     0     0    0 .962   .6
GaM3     0     0    0 .038   .6
CaM4     0 .2786   .5        .9
NaA   .017    .5 .068   .5  2.3