Mineral Information and Data:

Kidwellite
NaFe3+9(PO4)6(OH)11 • 3H2O [CNMNC approved formula]

Named for Albert Laws Kidwell (1919-), Houston, Texas.

IMA status : Approved Species 1978 ()
CLASSIFICATION 
Dana
(8th edition) :
42.08.02.01  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.08) where (AB)7 (XO4)4 Zq · x(H2O)
  (42.08.02)
  
Nickel-Strunz
(10th edition) :
08.DK.20
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DK) With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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