Mineral Information and Data:

Avdoninite
K2Cu5Cl8(OH)4 • H2O [CNMNC approved formula]

Named for Vladimir Nikolaevich Avdonin (b 1925), a senior researcher of the Ural Geological Museum of the Ural State Mining University.

IMA status : Approved Species 2005 (IMA2005-046a)
CLASSIFICATION 
Dana
(8th edition) :
12.01.12.01  
  (12) Compound Halides
  (12.01) with miscellaneous anions
  (12.01.12)
  
Nickel-Strunz
(10th edition) :
03.DA.55
  (03) Halides
  (03.D) Oxyhalides, Hydroxyhalides and Related Double Halides
  (03.DA) With Cu, etc., without Pb
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 24.34Å, b = 5.878Å, c = 11.626Å; β = 93.3°
Crystal Habit: Imperfect, short-prismatic, partly flattened crystals up to 0.2 mm in length in aggregates, and in pseudomorphs after melanothallite
  
Color: Green
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 3
Measured Density: 3.03 g/cm3
Cleavage: Perfect on {100}
Tenacity: Brittle
Fracture: Step-like
Streak: Pale green
  
Geologic Setting: Volcanic fumarole.
Mineral Association: Paratacamite, Langbeinite, Euchlorine, Belloite, Atacamite (Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia)
  

<<< BACK TO MINERAL SEARCH