Mineral Information and Data:

Katoptrite
Mn2+13Al4Sb5+2O20(SiO4)2 [CNMNC approved formula]

Named from the Greek for "mirror", for the perfectly reflecting cleavage surfaces.

IMA status : Valid species (Pre-IMA 1917) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
44.03.05.01  
  (44) Antimonates
  (44.03) with miscellaneous formulae
  (44.03.05)
  
Nickel-Strunz
(10th edition) :
09.AE.40
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AE) Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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