Hydrotalcite

C_0.167H₁₄Al_0.333Mg_0.667O₃

Allmann, R.Jepsen, H. P.

Neues Jahrbuch fur Mineralogie, Monatshefte (1969) 1969, 544-551

a=3.054Å   b=3.054Å   c=22.81Å

α=90°   β=90°   γ=120°