Boralsilite

Al₁₆B_6.04O₃₇Si_1.96

Grew, E. S.Graetsch, H. A.Poter, B.Yates, M. G.Buick, I.Bernhardt, H.-J.Schreyer, W.Werding, G.Carson, C. J.Clarke, G. L.

American Mineralogist (2008) 93, 283-299

a=14.797Å   b=5.5800Å   c=15.095Å

α=90°   β=91.750°   γ=90°