Mineral Information and Data:

Algodonite
Cu1-xAsx(x0.15) [CNMNC approved formula]

Named for the locality : Chile, Algodones silver mn, Coquimbo.

IMA status : Valid species (Pre-IMA 1857) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.01.01.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.01) where Am Xp, with m:p>3:1
  (02.01.01)
  
Nickel-Strunz
(10th edition) :
02.AA.10a
  (02) Sulfides
  (02.A) Simple Sulfides, Selenides, etc
  (02.AA) Alloys of metalloids with Cu, Ag, Au
  
Crystal system: Hexagonal System
Point group (H-M): 6/mmm (or 6/m 2/m 2/m) — dihexagonal-dipyramidal
Unit cell: a = 2.600 Å, c = 4.228 Å
  
Color: Silver-white to steel-gray; tarnishes rapidly to dull brown
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 4
Measured Density: 8.38 g/cm3
  
Geologic Setting: Uncommon in hydrothermal deposits, intimately associated with other copper
arsenides.
Mineral Association: Copper (typically arsenian), silver, domeykite, koutekite
  
Synonyms/varieties: Whitneyite

 

Algodonite
Origin: Keweenaw Peninsula, Michigan, U.S.A.
Sample size: 8.4 x 5.3 x 5.3 cm
Photo: Rob Lavinsky

 

Algodonite
Mounted specimen of the above, tarnished brown due to exposure.

 

Algodonite
Algodonite with quartz
Origin: Houghton Co., Keweenaw Peninsula, Michigan, U.S.A.
Sample size: 5.6 x 5.2 x 3.5 cm
Photo: Rob Lavinsky

 

Algodonite
(zoom-in of above)

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