Mineral Information and Data:

Kornerupine
(Mg,Fe2+,Al,[])10(Si,Al,B)5O21(OH,F) [CNMNC approved formula]

Named after the Danish geologist, Andreas Nikolaus Kornerup (1857-1881).

IMA status : Valid species (Pre-IMA 1884) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
58.01.01.01  
  (58) Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.01) with cations in [4] and higher coordination; single and double groups (n=1,2)
  (58.01.01) Kornerupine Group
  
Nickel-Strunz
(10th edition) :
09.BJ.50
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BJ) Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  
Other Properties: Gemstone Rare.

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