Dims: 3.0" x 3.1" x 1.6"(7.6 x 7.9 x 4.1 cm)
Wt: 7.43 oz.(210.9 g.)
Rennselear, Indiana, U.S.A.
I think that this is one of the most interesting metallic sulfide specimens that I have yet seen. It contains both Marcasite and pyrite, but their association is anything but ordinary. The pyrite occurrs in a large pyritohedron that measures about 1.3"(3.3 cm) in diameter. The Marcasite occurs as a coating over the pyritohedron that covers at least 80% of its surface; only a small portion of one face of the pyrite crystal is visible. The crust has crystalline tendencies, with misshapen clusters and diamond-shaped prisms projecting outwards. Many tiny crystals also coat the host rock, which appears to be a dark limestone. I have not seen a formation like this before, especially from Indiana!