Mineral Information and Data:

Antlerite
Cu2+3SO4(OH)4 [CNMNC approved formula]

Named after its locality: Antler mine, Mojave Co., Arizona, USA. Discovered in 1889.

IMA status : Approved Species 1967 ()
CLASSIFICATION 
Dana
(8th edition) :
30.01.12.01  
  (30) Anhydrous Sulfates Containing Hydroxyl or Halogen
  (30.01) where (A B)m (XO4)p Zq where m:p>2:1
  (30.01.12)
  
Nickel-Strunz
(10th edition) :
07.BB.15
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.B) Sulfates (selenates, etc.) with Additional Anions, without H2O
  (07.BB) With medium-sized cations
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 8.25 Å, b = 12.01 Å, c = 6.04 Å
Crystal Habit: Crystals thick tabular, short prismatic, equant; aggregates of fibrous or acicular crystals; cross-fibre veinlets, granular
  
Color: Emerald-green to blackish green, light green
Diaphaneity: Translucent
Luster: Vitreous
Hardness (Mohs): 3.5
Measured Density: 3.88 g/cm3
Cleavage: 2; {010} perfect, {100} indistinct
Tenacity: Brittle
Streak: Pale green
  
Geologic Setting: Uncommon, typically formed in the oxidized zone of copper deposits under highly acid conditions, especially in arid regions.
Mineral Association: Brochantite, atacamite, chalcanthite, krohnkite, natrochalcite, linarite, gypsum
  

 

Antlerite
Green, less than 1 mm, acicular crystals in vuggy area about 1.5 cm in galena matrix.
Origin: Tiger, Pinal Co., Arizona, U.S.A.
Sample size: 4 x 2 x 1.5 cm
Photo: Tom Loomis

 

Antlerite
(zoom-in of above)

 

Antlerite
Origin: Chuquicamata, Antofogasta, Chile
Sample size: 12 x 9 x 5 cm
Photo: Rob Lavinsky

 

Antlerite
(zoom-in of above)

 

Antlerite
(zoom-in of above)

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