Mineral Information and Data:

Olmsteadite
KFe2+2NbO2(PO4)2 • 2H2O [CNMNC approved formula]

Named for Milo Olmstead, micromount mineral collector, Rapid City, South Dakota, USA.

IMA status : Approved Species 1976 ()
CLASSIFICATION 
Dana
(8th edition) :
42.07.11.01  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.07) where (AB)5 (XO4)3 Zq · x(H2O)
  (42.07.11) Olmsteadite Group
  
Nickel-Strunz
(10th edition) :
08.DJ.05
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DJ) With large and medium-sized cations, (OH, etc.):RO4 = 1:1
  
Crystal system: Orthorhombic System
Point group (H-M): mm2 — pyramidal
  
  
  

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