Mineral Information and Data:

Steenstrupine-(Ce)  
Na14Ce6Mn2+2Fe3+2Zr(PO4)7Si12O36(OH)2 • 3H2O [CNMNC approved formula]

Named Name for Knud Hohannes Vogelius Steenstrup (1842-1913), geologist, Copenhagen, Denmark.

IMA status : Approved Species 1881 ()
CLASSIFICATION 
Dana
(8th edition) :
61.04.02.01  
  (61) Cyclosilicate Six-Membered Rings
  (61.04) with other anions
  (61.04.02) Steenstrupine group
  
Nickel-Strunz
(10th edition) :
09.CK.20
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CK) [Si6O18]12- branched 6-membered single rings, with insular complex anions
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
  
  
  
Other Properties: Radioactive.

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