[en] A powder neutron diffraction structure analysis of a dehydrated Na-A zeolite with Si/Al ratio of unity confirmed that the space group is R3 and verified the Si:Al ordering scheme proposed by Bursill, Lodge, Thomas and Cheetham (J. Phys. Chem., (1981)). Each cuboctahedral cage of the aluminosilicate framework contains one 3-fold axis and each Si(Al) is connected via oxygen bridges to 3Al (Si) and one other Si(Al). Total profile analysis by the Rietveld method gave cell parameters a=17.392 A, α = 59.62 deg. and final profile reliability index as 9.78%