AM_Ashcroftine-(Y)_1 Formula: Si25.92 O103.36 C8 (Y10.28 Ca1.72) K5 Na5.4 B2.08 H9.1 Name: Ashcroftine-(Y) Unit cell: 24.039 24.039 17.538 90.0 90.0 90.0 , V=10134.75 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 Merlino