Enstatite

Al_0.23Mg_0.874O₃Si_0.875

Smyth, J. R.Mierdel, K.Keppler, H.Langenhorst, F.Dubrovinsky, L.Nestola, F.

American Mineralogist (2007) 92, 973-976

a=18.1876Å   b=8.7352Å   c=5.1789Å

α=90°   β=90°   γ=90°