Clinochlore

Al_1.75Cr_0.25H₈Mg₅O₁₈Si₃

Phillips, T. L.Loveless, J. K.Bailey, S. W.

American Mineralogist (1980) 65, 112-122

a=5.334Å   b=9.228Å   c=14.371Å

α=90.53°   β=97.43°   γ=89.90°