Mineral Information and Data:

Aurichalcite
Zn5(CO3)2(OH)6 [CNMNC approved formula]

Named from the Latin for golden copper, brass, for the copper and zinc content of the mineral.

IMA status : Valid species (Pre-IMA 1839) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
16a.04.02.01  
  (16a) Carbonates - Hydroxyl or Halogen
  (16a.04) where (A B)5 (XO3)2 Zq
  (16a.04.02)
  
Nickel-Strunz
(10th edition) :
05.BA.15
  (05) Carbonates and Nitrates
  (05.B) Carbonates with additional anions, without H2O
  (05.BA) With Cu, Co, Ni, Zn, Mg, Mn
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 13.82Å, b = 6.419Å, c = 5.29Å; β = 101.04°
Crystal Habit: As acicular to lathlike crystals with prominent {010}, commonly striated || [001], with wedgelike terminations, to 3 cm. Typically in tufted divergent sprays or spherical aggregates, may be in thick crusts; rarely columnar, laminated or granular.
  
Color: Green, greenish blue, sky-blue; colorless to pale blue, pale green in transmitted light
Diaphaneity: Transparent to translucent
Luster: Silky to pearly
Hardness (Mohs): 1 - 2
Measured Density: 3.96 g/cm3
Cleavage: On {010} and {100}, perfect
Tenacity: Fragile
  
Geologic Setting: In the oxidized zones of copper and zinc deposits
Mineral Association: Rosasite, smithsonite, hemimorphite, hydrozincite, malachite, azurite
  

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