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: FCrPA-A3
_database_code_amcsd 0001083
9.8402 17.9800 5.2914 90 105.108 90 C2/m
atom     x     y    z occ Biso
O1    .113 .0876 .212       .8
O2    .114 .1703 .740       .8
F3    .100     0 .714       .8
O4    .359 .2498 .792       .8
O5    .363 .1379 .134      1.1
O6    .342 .1116 .622      1.1
O7    .356     0 .295      1.2
SiT1 .2817 .0824 .301 .75   .4
AlT1 .2817 .0824 .301 .25   .4
SiT2 .2924 .1703 .813 .75   .4
AlT2 .2924 .1703 .813 .25   .4
MgM1     0 .0879   .5 .92   .6
CrM1     0 .0879   .5 .08   .6
MgM2     0 .1767    0 .84   .6
CrM2     0 .1767    0 .16   .6
MgM3     0     0    0       .6
CaM4     0 .2776   .5       .9
NaA   .031    .5 .072  .5  2.3