AM_Cordierite_38
Formula: O18.7 Al4 Si5 Mg2 Na.05
Name: Cordierite
Unit cell: 17.066 9.722 9.345 90.0 90.0 90.0 , V=1550.48
Space group: CCCM (66)

Armbruster T , Physics and Chemistry of Minerals , 12 (1985) p.233-245, Ar, N2, CO2 in the structural cavities of cordierite,, an optical and X-ray single-crystal study, Sample: Ruby Island natural