Mineral Information and Data:

Akdalaite
(Al2O3)4-5 • H2O [CNMNC approved formula]

Named for the locality; Akdala, region of Karagandin, Kazakhstan.

IMA status : Approved Species 1969 (IMA1969-002)
CLASSIFICATION 
Dana
(8th edition) :
04.03.02.01  
  (04) Simple Oxides
  (04.03) with a cation charge of 3+ (A+++2 O3)
  (04.03.02)
  
Nickel-Strunz
(10th edition) :
04.FL.05
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FL) Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
  
Crystal system: Hexagonal System
Point group (H-M): 6mm — dihexagonal-pyramidal
Unit cell: a = 12.87 Å, c = 14.97 Å
Crystal Habit: Crystals tabular, elongated, tiny, hexagonal section; lens-like or nest-like aggregates.
  
Color: White
Diaphaneity: Translucent
Luster: Vitreous to porcelaneous
Hardness (Mohs): 7-7.5
Measured Density: 3.68 g/cm3
Tenacity: Brittle
Fracture: Irregular/Uneven
Streak: White
  
Geologic Setting: In veinlets cutting amesite-fluorite-muscovite rock and fluorite-magnetite- diopsidevesuvianite skarn.
Mineral Association: Muscovite, fluorite, amesite, magnetite, diopside, vesuvianite, andradite
  

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