Esseneite

Al_1.34Ca_0.97Fe_0.61O₆Si_1.08

Cosca, M. A.Peacor, D. R.

American Mineralogist (1987) 72, 148-156

a=9.79Å   b=8.822Å   c=5.37Å

α=90°   β=105.81°   γ=90°