Mineral Information and Data:

Freudenbergite
Na2(Ti,Fe3+)8O16 [CNMNC approved formula]

Named for Wilhelm Freudenberg (1881-), German geologist, who studied the rocks of Odenwald, Germany, where the mineral was found.

IMA status : Approved Species 1961 ()
CLASSIFICATION 
Dana
(8th edition) :
07.09.03.01  
  (07) Multiple Oxides
  (07.09)
  (07.09.03)
  
Nickel-Strunz
(10th edition) :
04.CC.10
  (04) Oxides and Hydroxides
  (04.C) Metal:Oxygen = 2:3, 3:5, and Similar
  (04.CC) With large and medium-sized cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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