Mineral Information and Data:

Segnitite
PbFe3+3AsO4(AsO3OH)(OH)6 [CNMNC approved formula]

Named for E. Ralph Segnit (1923-1999), mineralogist and petrologist, University of Adelaide, Adelaide, Australia, for his contributions to Australian mineralogy.

IMA status : Approved Species 1992 ()
CLASSIFICATION 
Dana
(8th edition) :
42.07.04.04  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.07) where (AB)5 (XO4)3 Zq · x(H2O)
  (42.07.04) Arsenocrandallite Group
  
Nickel-Strunz
(10th edition) :
08.BL.10
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BL) With medium-sized and large cations, (OH, etc.):RO4 = 3:1
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
  
  
  

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