Pyrite
Martin Marietta Materials Cement quarry, Midlothian, Ellis County, Texas, USA
10.2 x 7.2 x 7.0 cm. A giant cluster of perfect, pristine, floater pyrite crystals, the largest to 4 cm. The surface has a beautiful, dark patina to it. While I have seen many small pyrites from the Dallas area, I have never seen such a large one in any kind of perfect condition like this. I obtained it from a local collector who got it years ago. ...
© Rob Lavinsky & irocks.com