Mineral Information and Data:

Brownmillerite
Ca2Al2O5 [CNMNC approved formula]

Named for Lorrin Thomas Brownmiller (1902-), Chef chemist of the Alpha Portland Cement Company, Easton, Pennsylvania, USA.

IMA status : Approved Species 1964 ()
CLASSIFICATION 
Dana
(8th edition) :
07.11.02.01  
  (07) Multiple Oxides
  (07.11) as titano-oxides with [4] and [6] substitutions
  (07.11.02)
  
Nickel-Strunz
(10th edition) :
04.AC.10
  (04) Oxides and Hydroxides
  (04.A) Metal:Oxygen = 2.1 and 1:1
  (04.AC) M:O = 1:1 (and up to 1:1.25); with large cations (+- smaller ones)
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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