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