This is a lot of two (2) fossilized clams. The clam shell is almost completely gone and has been replaced by calcite and mineral. These were recovered from Miocene-epoch (approx. 5,000,000 to 23,000,000 years ago) deposits in the Bone Valley formation of Florida (Hawthorn Group). When cut or broken open, these clams often contain golden-amber colored calcite crystals. I decided not to cut these because they are so complete and have both sides of the clam shell cast. I do not know if these contain large calcite crystals or not, but most do. The smallest one measures approx. 1.25 inches in diameter, and the larger one is just short of 1.5 inches.
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing both of the specimens shown.