Mineral Information and Data:

Shigaite
NaAl3Mn2+6(SO4)2(OH)18 • 12H2O [CNMNC approved formula]

Named for the locality: Loi mine, Shinga Prefecture, Japan.

IMA status : Approved Species 1985 ()
CLASSIFICATION 
Dana
(8th edition) :
31.01.02.01  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.01) where (A+ B++)m (XO4)p Zq · x(H2O), where m:p>6:1
  (31.01.02)
  
Nickel-Strunz
(10th edition) :
07.DD.35
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DD) With only medium-sized cations; sheets of edge-sharing octahedra
  
Crystal system: Trigonal System
Point group (H-M): 3 — rhombohedral
  
  
  

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