This is a fossil land tortoise bone (Hesperotestudo sp.). This bone comes from the leg-pelvis joint (ilium). This bone is well-preserved and mineralized, but is incomplete with a fracture on one end. Bones from this animal are quite rare and this is the only one I have found during many fossil hunts. This specimen was recovered from the Peace River, Bone Valley Formation, Hawthorn Group, Florida. This area has rich deposits of fossils from the Miocene, Pliocene, and Pleistocene periods (approx. 11,000 to 23,000,000+ years ago).
Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. It measures a little over 4-inches (100mm) in length.