#SPYR 55:  8.5 x 6.5 x 3 cm (3.35 x 2.6 x 1.2 inches) - $20

2.2 cm (0.9 inch) single pyrite cube is perched in the end of a marl matrix base.  One corner nick on the back side is noticeable but does not detract too much from the specimen.  Nice example.