Mineral Information and Data:

Boromullite
Al9BSi2O19 [CNMNC approved formula]

Named as the boron analog to mullite.

IMA status : Approved Species 2007 ()
CLASSIFICATION 
Dana
(8th edition) :
52.02.02a.03  (This Dana# Added)
  (52) Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.02) with cations in [4] and >[4] coordination
  (52.02.02a) Al2SiO5 (Sillimanite subgroup)
  
Nickel-Strunz
(10th edition) :
09.AF.23
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AF) Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
  
Crystal system: Orthorhombic System
Point group (H-M): mm2 — pyramidal
  
  
  

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