Mineral Information and Data:

Aerugite
Ni8.5(AsO4)2As5+O8 [CNMNC approved formula]

Named in 1858 from the Greek for copper rust, an allusion to its appearance.

IMA status : Redefined IMA Approved; 1965 ()
CLASSIFICATION 
Dana
(8th edition) :
38.05.10.01  
  (38) Anhydrous Phosphates, etc
  (38.05) with miscellaneous formulae
  (38.05.10)
  
Nickel-Strunz
(10th edition) :
08.BC.15
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BC) With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Unit cell: a = 5.951 Å, c = 27.568 Å
Crystal Habit: Massive; finely crystalline
  
Color: Dark grass-green, blue-green, pale brown
Diaphaneity: Semitransparent
Hardness (Mohs): 4
Measured Density: 5.85 g/cm3
Streak: Light green to light blue-green
  
Geologic Setting: A rare secondary mineral in hydrothermal Ni–As–U ore deposits.
Mineral Association: Bismuth, bunsenite, xanthiosite (Johanngeorgenstadt, Germany); xanthiosite (South Terras mine, Cornwall, England).
  

 

Aerugite
Specimen with some microscopic crystals of the exceedingly rare mineral aerugite. This specimen also has minor xanthiosite asociated with it. Prior to this German find it was known from the walls of furnaces in Cornwall used to roast ore.
Origin: Johanngeorgenstadt, Saxony, Germany
Sample size: 3 x 2 mm
Photo: John Veevaert, Trinity Mineral Co

 

Aerugite
(zoom-in of above)

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