Pyrite, Magnetite, Malachite French Creek Mines, St. Peter, Chester Co., PA. Ex. Dr. Steve Chamberlain collection. This is one of those old classic from a noteworthy east coast occurrence. This attractive piece measures 5.8 x 5.6 x 5.2 cm and has a centrally located octahedron of pyrite.  No damage.  Main pyrite has a small natural contact area on one corner.  A good piece from a classic locale. $95