A nice example of dolomite with chalcopyrite, apart from the obvious contrast between the two species, pieces from this find were notable for the relative transparency of the dolomites-- apart from the classic specimens from Eugui in Spain, it is not too common to find dolomite of this quality. Some, like this one, also have slight purplish tinge, and I would point out that it was not easy to find pieces without obvious damage-- I guess the cleavability of the dolomite combined with weaknesses imparted by semi-embedded chalcopyrite made them easier to break during extraction.
I am writing "Shanxi Province" for the locality, but these are new enough that they are still in the stage where accurate information is obscured-- I first saw them at a shop near a mine in Hubei, and have since seen them labeled as coming from Hebei and Shanxi....
Usually I trim the number of photographs down more, but this one is pretty from many angles, so....I didn't.