A Geoscience Digital Image Library

TitleChalcocite with chalcopyrite
DescriptionChalcocite, Cu2S (copper sulfide), is often found with chalcopyrite CuFeS2. Chalcocite is shiny and lead-gray when freshly broken, but turns black and becomes sooty when exposed to air. Chalcopyrite is yellow, sometimes slightly orangish or with a hint of green, when fresh. It may tarnish, as seen in this sample. Chalcocite and chalcopyrite are both important sources of copper (and iron).
PhotographerDarla Sondrol. 2001-07-10.
CollectionUniversity of North Dakota Mineralogy Collection.
Key wordschalcocite
Tech details461 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number1094