Klyuchevskite

Al_0.18Cu₃Fe_0.82K₃O₁₈S₄

Gorskaya, M. G.Filatov, S. K.Rozhdestvenskaya, I. V.Vergasova, L. P.

Mineralogical Magazine (1992) 56, 411-416

a=18.6670Å   b=4.94Å   c=18.405Å

α=90°   β=101.5°   γ=90°