Pyrite and Sphalerite    Huanzala Mine, Huallanca District, Dos de Mayo Province, Peru.  Ex. Dr. Steve Chamberlain collection.  This interesting specimen measures 7.9 x 5.6 x 3.5 cm.  Very lustrous pyrites with small amounts of nicely formed silver colored sphalerites along one side.  What makes the piece interesting are the fine growth hillocks that can be seen on many of the pyrite faces.  A few chips as can be seen.  $100