New structure

Al₇B₃KMg₂O₂₈Si₆

Lussier, A.Ball, N.A.Hawthorne, F.C.Henry, D.J.Shimizu, R.Ogasawara, Y.Ota, T.

American Mineralogist (2016) 101, 355-361

a=15.955(10)Å   b=15.955(10)Å   c=7.227(4)Å

α=90°   β=90°   γ=120°