Mineral Information and Data:

Chalcopyrite
CuFeS2 [CNMNC approved formula]

Named from composition: copper and pyrite.

IMA status : Valid species (Pre-IMA 1747) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.09.01.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.09) where Am Bn Xp, with (m+n):p=1:1
  (02.09.01) Chalcopyrite Group (Tetragonal: I-42d)
  
Nickel-Strunz
(10th edition) :
02.CB.10a
  (02) Sulfides
  (02.C) Metal Sulfides, M:S = 1:1 (and similar)
  (02.CB) With Zn, Fe, Cu, Ag, etc.
  
Crystal system: Tetragonal System
Point group (H-M): 42m (or 4 2m) — scalenohedral
Unit cell: a = 5.289 Ǻ, c = 10.42 Ǻ
Crystal Habit: Crystals spheroidal, resemble tetrahedrons; massive, compact; reniform, botryoidal
Twinning: On {112}, contact, penetration, repeated (fivelings), or lamellar; on {012}; on {110} about [100] axis, penetration
  
Color: Brass-yellow, tarnishes iridescent
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 3.5 to 4
Measured Density: 4.35 g/cm3
Cleavage: 1; {011} sometimes distinct
Tenacity: Brittle
Fracture: Uneven
Streak: Greenish black
  
Polymorphism and Series: Forms a series with eskebornite.
Geologic Setting: A primary mineral in hydrothermal veins, stockworks, disseminations, and massive
replacements; an exsolution product in mafic igneous rocks; of sedimentary origin controlled by
redox conditions.
Mineral Association: Sphalerite, galena, tetrahedrite, pyrite, many copper sulfides
Ore deposits: Most copper ore bodies are mined from minerals created by weathering of the primary copper ore mineral chalcopyrite.
  
Synonyms/varieties: Copper Pyrites, Yellow Pyrite, Yellow Copper Ore

 

Chalcopyrite
Origin: Ani Mine, Aniai, Akita-Ken, Honshu, Japan
Sample size: 3.5 x 2.5 x 2
Photo: Tom Loomis

 

Chalcopyrite
(zoom-in of above)

 

Chalcopyrite
Origin: Milliken (Sweetwater) mine, Reynolds Co., Missouri, U.S.A.
Sample size: 2.5 x 1 x 5 cm matrix
Photo: Dan Weinrich

 

Chalcopyrite
(zoom-in of above)

<<< BACK TO MINERAL SEARCH