Aqualite is a very rare mineral of the eudialyte group, with formula (H3O)8(Na,K,Sr)5Ca6Zr3SiSi(Si24O66)(OH)9Cl.
The original formula was extended to show the presence of silicon at both M3 and M4 sites, according to the nomenclature of the eudialyte group.
[4] Aqualite is unique among the eudialyte group in being hydronium-rich (the only other eudialyte-group species with essential hydronium, is the recently discovered ilyukhinite).
[2] Among the other representatives of the group it also distinguish in splitting of the M1 site into two sub-sites, both occupied by calcium.
Associated minerals are aegirine, batisite, eckermanite, innelite, lorezenite, natrolite, microcline, thorite, and galena.