Mineral Information and Data:

Alvanite
(Zn,Ni)Al4(VO3)2(OH)12 • 2H2O [CNMNC approved formula]

Named for the ALuminum and VANadium in the composition.

IMA status : Approved Species 1959 ()
CLASSIFICATION 
Dana
(8th edition) :
42.13.13.01  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.13)
  (42.13.13) Alvanite Group
  
Nickel-Strunz
(10th edition) :
08.FE.05
  (08) Phosphates, Arsenates, Vanadates
  (08.F) Polyphosphates, Polyarsenates, [4]-Polyvanadates
  (08.FE) Ino-[4]-vanadates
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 17.808 Å, b = 5.123 Å, c = 8.881 Å, b = 92.11°
Crystal Habit: Mica-like platelets with hexagonal form
Twinning: Polysynthetic parallel to {010}
  
Color: Light bluish green to bluish black
Diaphaneity: Semi-transparent
Luster: Vitreous, pearly on cleavage
Hardness (Mohs): 3- 3.5
Measured Density: 2.41 - 2.50 g/cm3
Cleavage: 1; {010} perfect
Streak: White
  
Geologic Setting: In the oxidation zone of a vanadiferous clay-anthraxolite horizon.
Mineral Association: Mica, roscoelite (?)
  

<<< BACK TO MINERAL SEARCH