AM_Boralsilite
Formula: Al8 Si B3 O18.525
Name: Boralsilite
Unit cell: 14.767 5.574 15.079 90.0 91.96 90.0 , V=1240.45
Space group: C12/M1 (12)

Peacor D R , Rouse R C , Grew E S , American Mineralogist , 84 (1999) p.1152-1161, The crystal structure of boralsilite and its relation to a family of, boroaluminosilicates, sillimanite, and andalusite