Mineral Information and Data:

Azurite
Cu3(CO3)2(OH)2 [CNMNC approved formula]

Named from the Persian lazhward, meaning "blue", in allusion to the color.

IMA status : Valid species (Pre-IMA 1805) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
16a.02.01.01  
  (16a) Carbonates - Hydroxyl or Halogen
  (16a.02) where (A B)3 (XO3)2 Zq
  (16a.02.01)
  
Nickel-Strunz
(10th edition) :
05.BA.05
  (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 = 5.01 Å, b = 5.84 Å, c = 10.34 Å, b = 92.5°
Crystal Habit: Crystals varied in habit and often modified; tabular or short prismatic, equant, or rhombohedral; massive, stalactitic, earthy, nodular concretions
Twinning: Rare on {101}, {102} or {001}
  
Color: Light blue to very dark blue, usually azure blue
Diaphaneity: Transparent to sub-translucent
Luster: Vitreous
Hardness (Mohs): 3.5 to 4
Measured Density: 3.773 g/cm3
Cleavage: 3; {011} slightly imperfect, {001} fair, {110} in traces
Tenacity: Brittle
Fracture: Conchoidal
Streak: Blue, lighter than color
  
Geologic Setting: In the oxidized zones of copper deposits associated with carbonate rocks; may
constitute an ore of copper.
Mineral Association: Malachite, chrysocolla, brochantite, antlerite, cuprite, cerussite, smithsonite,
calcite, dolomite
  
Synonyms/varieties: Blue copper, chessylite
Other Properties: Gemstone Rare.
Comments: Azurite is often pseudomorphed to Malachite, and the two are very frequently found together.

 

Azurite
Azurite on malachite
Origin: Liu Feng Shan mine, Anhui Province, China
Sample size: 4.5 x 3.5 x 3 cm
Photo: Tom Loomis

 

Azurite
(zoom-in of above)

 

Azurite
Azurite with malachite
Origin: Candelaria mine, Esmeralda Co., Nevada, U.S.A.
Sample size: 5 x 4 x 2 cm, "blooms" to 8 mm
Photo: Tom Loomis

 

Azurite
(zoom-in of above)

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