AM_Natroalunite-2R
Formula:
S4 Al6 O28 K.2 Na.72 Ca.54 H12
Name:
Natroalunite-2R
Unit cell:
6.981 6.981 33.49 90.0 90.0 120.0 , V=1413.45
Space group:
R-3M (166)
Ossaka J , Hirabayashi J , Okada K , Kobayashi R , Hayashi T , American Mineralogist , 67 (1982) p.114-119, Crystal structure of minamiite, a new mineral of the alunite group