AM_Harkerite
Formula:
Mg8 Ca24 B8 Si8 C8 Al2 O81 (Cl H)
Name:
Harkerite
Unit cell:
18.131 18.131 18.131 33.46 33.46 33.46 , V=1613.62
Space group:
R-3M (166)
Giuseppetti G , Mazzi F , Tadini C , American Mineralogist , 62 (1977) p.263-272, The crystal structure of harkerite