AM_Melilite
Formula:
(Ca1.7 Na.2 K.1) Si2 Mg.5 Al.4 O7
Name:
Melilite
Unit cell:
7.789 7.789 5.018 90.0 90.0 90.0 , V=304.43
Space group:
P-421M (113)
Smith J V , American Mineralogist , 38 (1953) p.643-661, Reexamination of the crystal structure of melilite