Ilyukhinite

Ilyukhinite is a very rare mineral of the eudialyte group,^[2] with formula (H₃O,Na)₁₄Ca₆Mn₂Zr₃Si₂₆O₇₂(OH)₂·3H₂O.^[4] The formula given is simplified and does not show the presence of cyclic silicate groups. Ilyukhinite is the second group representative with species-defining hydronium ion after aqualite.^[2]

Ilyukhinite
General
Category	Silicate mineral, cyclosilicate
Formula	see text
IMA symbol	Ily[1]
Crystal system	Trigonal
Crystal class	Ditrigonal pyramidal (3m) H-M symbol: (3m)
Space group	R3m
Unit cell	a = 14.1695, c = 31.026 [Å]
Identification
References	[2][3]