AM_Ashcroftine-(Y) Formula: Si54.16 O202.96 C16 Y24 K10.4 Na8.26 H14.8 Name: Ashcroftine-(Y) Unit cell: 23.994 23.994 17.512 90.0 90.0 90.0 , V=10081.87 Space group: I4/MMM (139)

Moore P B , Sen Gupta P K , Schlemper E O , Merlino S , American Mineralogist , 72 (1987) p.1176-1189, Ashcroftine, ca. K10Na10(Y,Ca)24(OH)4(CO3)16(Si56O140).16H2O, a, structure with enormous polyanions, Sample: investigated by Moore, Sen Gupta, Schlemper