Mineral Information and Data:

Hydrodresserite
BaAl2(CO3)2(OH)4 • 3H2O [CNMNC approved formula]

Named for essential water and characteristic dehydration to dresserite under low humidity conditions.

IMA status : Approved Species 1977 ()
CLASSIFICATION 
Dana
(8th edition) :
16b.02.02.01  
  (16b) Carbonates - Hydroxyl or Halogen
  (16b.02) where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=3:2
  (16b.02.02)
  
Nickel-Strunz
(10th edition) :
05.DB.15
  (05) Carbonates and Nitrates
  (05.D) Carbonates with Additional Anions, with H2O
  (05.DB) With large and medium-sized cations
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  

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