Mineral Information and Data:

Alumoklyuchevskite
K3Cu2+3AlO2(SO4)4 [CNMNC approved formula]

Named as the aluminum dominant analog of klyuchevskite.

IMA status : Approved Species 1995 (IMA1993-004)
CLASSIFICATION 
Dana
(8th edition) :
28.04.06.02  
  (28) Anhydrous Acid and Sulfates
  (28.04) with miscellaneous formulae
  (28.04.06) Klyuchevskite Group
  
Nickel-Strunz
(10th edition) :
07.BC.45
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.B) Sulfates (selenates, etc.) with Additional Anions, without H2O
  (07.BC) With medium-sized and large cations
  
Crystal system: Monoclinic System
Point group (H-M): 2 — sphenoidal
Unit cell: a = 18.432 Å, b = 5.139 Å, c = 18.69 Å, b = 101.12°
Crystal Habit: Aggregates of acicular crystals to 1 mm long
  
Color: Dark green
Diaphaneity: Transparent
Hardness (Mohs): 2 - 2.5
Measured Density: 3.1 g/cm3
Cleavage: 1; along (001) perfect
Streak: Light green
  
Geologic Setting: Deposited by fumarolic gases.
Mineral Association: Fedotovite, tenorite, lammerite, averievite, piypite, langbeinite
  

 

Alumoklyuchevskite
Very small olive-greenish prismatic crystals of alumoklyuchevskite
Origin: Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
Sample size: 1.8 x 1.5 mm
Photo and owner: Thomas Witzke

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