A large pyrite specimen from the Racracancha mine.  Racracancha has produced mainly cubic pyrite, virtually always with striated faces,  and this is a particularly large example. 

For the size , it is in remarkably good shape—I see only ONE spot of damage on the display face, it is the corner of the largest crystal (this is visible in the pictures.) Obviously, the larger a specimen is, the greater the chances that it will be damaged.  The greater area alone accounts for much of this increased probability, though there is also an increased difficulty of extraction.

Racracancha is a long abandoned mine, which around 2007 was rediscovered by local miners who for the last few years have been working to extract mineral specimens.  The mine is most notable for its striated pyrites, included calcites, and manganocalcites. 

The back is mostly crystallized as well.