Mineral Information and Data:

Brochantite
Cu4SO4(OH)6 [CNMNC approved formula]

Named to honot the French geologist and mineralogist, A. J. M. Brochant de Villiers (1772-1840). First published in 1824. Approved and defined (IMA, 1980)

IMA status : Approved Species 1980 (IMA1980-s.p.)
CLASSIFICATION 
Dana
(8th edition) :
30.01.03.01  
  (30) Anhydrous Sulfates Containing Hydroxyl or Halogen
  (30.01) where (A B)m (XO4)p Zq where m:p>2:1
  (30.01.03)
  
Nickel-Strunz
(10th edition) :
07.BB.25
  (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: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: P21/a
Unit cell: a =13.08Ǻ, b = 9.85Ǻ, c = 6.02Ǻ, β = 103.3666°, Z=4
Crystal Habit: Crystals are typically thick prismatic to acicular, elongated along [001] or [010], to 5 cm; may be flattened [001]; about 40 forms known; in aggregates, druses, crusts, also massive, granular.
Twinning: On {100}, common, giving a pseudo-orthorhombic appearance.
  
Color: Emerald-green, blackish green, pale green; bluish green in transmitted light
Diaphaneity: Transparent to translucent
Luster: Vitreous, somewhat pearly on cleavages
Hardness (Mohs): 3.5 - 4
Measured Density: 3.97 g/cm3
Cleavage: On {100}, perfect
Fracture: Uneven to conchoidal
Streak: Pale green
  
Geologic Setting: Common in the oxidized zone of copper deposits, yet rarely an ore; formed under low acidity, principally in arid regions.
Mineral Association: Malachite, azurite, tenorite, cuprite, linarite, caledonite, cerussite, atacamite, chrysocolla, cyanotrichite, iron oxides
  

 

Brochantite
Origin: Mex-Tex Mine, Hansonburg Mining Dist., Socorro Co., New Mexico, USA.
Sample size: 4.5 x 3.5 x 2 cm
Photo: Tom Loomis

 

Brochantite
(zoom-in of above)

 

Brochantite
Glassy prismatic crystals in radial sprays to 3 mm. Associated with minor linarite.
Origin: California mine, Copiapo, Chile
Sample size: 5 x 4 x 1.5 cm
Photo: Tom Loomis

 

Brochantite
(zoom-in of above)

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