Mineral Information and Data:

Attikaite
Ca3Cu2Al2(AsO4)4(OH)4 • 2H2O [CNMNC approved formula]

Named for the locality: Christiana mine No. 132, Kamareza, Lavrion District, Attií Prefecture, Greece.

IMA status : Approved Species 2006 (IMA2006-017)
CLASSIFICATION 
Dana
(8th edition) :
42.06.05.03  (This Dana# Added)
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.06) where (AB)2 (XO4) Zq · x(H2O)
  (42.06.05) Strashimirite Group
  
Nickel-Strunz
(10th edition) :
08.DJ.45
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DJ) With large and medium-sized cations, (OH, etc.):RO4 = 1:1
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 10.01Å, b = 8.199Å, c = 22.78Å
Crystal Habit: Sparsely scattered, minute botryoids of pale green aggregates, comprised of submicroscopic, intergrown needles
  
Color: Light blue, greenish blue
Hardness (Mohs): 2.5 - 3
Measured Density: 3.2 g/cm3
Cleavage: Perfect mica-like on {001}
Streak: Pale blue
  
  

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