ABSTRACT
The Na 4 MgCa 3 Al 4 (AsO 3 OH) 12 ·9H 2 O multinary compound (mineral currierite), which crystallizes in the hexagonal structure with the lattice parameters a = 1,220.57 ± 0.09 and c = 920.52 ± 0.07 and the calculated and experimental densities of 3.005 and 3.08 ± 0.02 g cm−3, respectively, is formed in the Al–H–Na–Mg–Ca–O–As system (Kampf et al. 2016, 2017b).
