AM_Pargasite_52
Formula: Na.74 K.02 Mg4.26 Fe.21 Al1.68 Cr.18 Ti.07 Ca.198 Si6.62 O24 H2
Name: Pargasite
Unit cell: 9.733 17.828 5.24 90.0 105.6 90.0 , V=875.75
Space group: C12/M1 (12)

Comodi P , Mellini M , Ungaretti L , Zanazzi P F , European Journal of Mineralogy , 3 (1991) p.485-499, Compressibility and high pressure structure refinement, of tremolite, pargasite and glaucophane, Sample: pressure at 35 kbar