Mineral Information and Data:

Athabascaite
Cu5Se4 [CNMNC approved formula]

Named for the locality: Martin Lake mine, Uranium City, Lake Athabasca, SK, Canada.

IMA status : Approved Species 1970 (IMA1969-022)
CLASSIFICATION 
Dana
(8th edition) :
02.16.17.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.16) with miscellaneous formulae
  (02.16.17)
  
Nickel-Strunz
(10th edition) :
02.BA.15d
  (02) Sulfides
  (02.B) Metal Sulfides, M:S > 1:1 (mainly 2:1)
  (02.BA) With Cu, Ag, Au
  
Crystal system: Orthorhombic System
Point group (H-M): Unknown — Unk
Unit cell: a = 8.227Å, b = 11.982Å, c = 6.441Å
Crystal Habit: As crystal laths, to 100 μm; also massive.
  
Color: Pale gray to white
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 2.5
Measured Density: 6.59 (calculated) g/cm3
  
Geologic Setting: As inclusions in and replacements of umangite, as stringers and veinlets in carbonate veins cutting basalt (Martin Lake mine, Canada).
Mineral Association: Umangite, clausthalite, eucairite, berzelianite, sulfatian berzelianite, klockmannite, eskebornite, tyrrellite, copper, silver, uraninite, hematite, pyrite, calcite, barite, quartz, feldspar (Martin Lake mine, Canada); berzelianite, eucairite, crookesite, tyrrellite, ferroselite, bukovite, krutaite, calcite, dolomite (Petrovice, Czech Republic); umangite, berzelianite (Sierra de Umango, Argentina)
  

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