Mineral Information and Data:

Averievite
Cu5O2(VO4)2 • n(Cu,Cs)Cl [CNMNC approved formula]

Named for V. V. Averiev [Averiev] (1929-1968), Russian volcanologist.

IMA status : Approved Species 1997 (IMA1995-027)
CLASSIFICATION 
Dana
(8th edition) :
41.04.05.02  (This Dana# Added)
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.04) where (A B)5 (XO4)2 Zq
  (41.04.05)
  
Nickel-Strunz
(10th edition) :
08.BB.85
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BB) With only medium-sized cations, (OH, etc.):RO4 about 1:1
  
Crystal system: Trigonal System
Point group (H-M): 3 — pyramidal
Unit cell: a = 6.375(1) Å, c = 8.399(1) Å
Crystal Habit: As pseudohexagonal crystals, to 0.3 mm, with {1010}, {0110}, {0001}, {0001}.
  
Color: Black
Diaphaneity: Opaque
Luster: Metallic to resinous
Hardness (Mohs): 3.5 - 4
Measured Density: 3.54 g/cm3
Cleavage: On {1010}, good
Tenacity: Brittle
Streak: Black
  
Geologic Setting: In volcanic fumaroles.
Mineral Association: Piypite, alumoklyuchevskite, fedotovite, alarsite, nabokoite, tenorite, lammerite, langbeinite
  

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