Mineral Information and Data:

Millisite
NaCaAl6(PO4)4(OH)9 • 3H2O [CNMNC approved formula]

Named for F. T. Millis of Lehi, Utah, who found the first specimens.

IMA status : Valid species (Pre-IMA 1930) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
42.07.09.01  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.07) where (AB)5 (XO4)3 Zq · x(H2O)
  (42.07.09)
  
Nickel-Strunz
(10th edition) :
08.DL.10
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DL) With large and medium-sized cations, (OH, etc.):RO4 = 2:1
  
Crystal system:  
Point group (H-M):
  
  
  

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