A exceptional pyrite specimen from Peru, I would say this thing is probably one in 10's of thousands.  To begin with, octahedrons are the least frequently encountered of the main pyrite habits at Huanzala, with pockets generally only encountered every couple years. Then, quartz associations have always been very rare here-- there were recently some more available thanks to a 2017 pocket, but it has always been a difficult thing to find from Huanzala.  The quartz adds a nice degree of contrast and separation between the pyrite crystals, making it somewhat different from the usual, tightly packed clusters.  Lastly, the luster is pretty good, and the pyrites are damage free!  All this combines to make a specimen that is seriously at least 1 out of tens of thousands-- and I would know, considering how much of this stuff I've seen over the years of traveling to Peru!