Mineral Information and Data:

Akhtenskite
MnO2 [CNMNC approved formula]

Named for the Akhtensk deposit, Russia, where it was first noted.

IMA status : Approved Species 1982 (IMA1982-072)
CLASSIFICATION 
Dana
(8th edition) :
04.04.10.01  
  (04) Simple Oxides
  (04.04) with a cation charge of 4+ (A++++ O2)
  (04.04.10)
  
Nickel-Strunz
(10th edition) :
04.DB.15b
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DB) With medium-sized cations; chains of edge-sharing octahedra
  
Crystal system: Hexagonal System
Point group (H-M): 6mm — dihexagonal-pyramidal
Unit cell: a = 2.84Å, c = 4.6Å
Crystal Habit: Platy aggregates, microscopic crystals with flaky to platy habit
  
Color: Light grey to black
Diaphaneity: Opaque
Measured Density: 4.78 (calculated) g/cm3
Cleavage: 1; {001}
Streak: Black
  
Polymorphism and Series: Trimorphous with pyrolusite and ramsdellite
Geologic Setting: In mixtures in “psilomelane” with other manganese oxides in an iron oxide deposit, probably bacterially altered from a previous mineral (Akhtensk deposit, Russia); in incrustations of ferromanganese minerals on oceanic basalt on a guyot (Mt. Zarod, Russia).
Mineral Association: Cryptomelane, nsutite, pyrolusite, todorokite, goethite (Akhtensk deposit, Russia); vernadite, manganite, Fe–Mn oxides (Mt. Zarod, Russia)
  

 

Akhtenskite
Origin: Akhtenskoe Deposit, Southern Ural, Russia (type locality)
Sample size: fragment in capsule
Photo: Diederik Visser

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