This is a specimen of fossilized Mammoth ivory. The tusks of the various Mammoth and Mastodon species had an inner core material and an outer "bark" material. Over time, the outer bark portion can become separated from the inner core material. These bark sections are often found in fossil deposits after the tusk itself has become lost or destroyed by the ravages of time. This specimen was recovered from the Peace River in the Bone Valley formation of Florida (Hawthorn Group).
Note, fossilized Mammoth ivory is tens of thousands of years old and is LEGAL to own. Only modern ivory from recent animals is illegal, so you can use or own this ivory without fear of legal repercussions. The specimen being offered here is from Pliocene and Pleistocene deposits (11,000 to 5,000,000+ years old).
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. It weighs approx. 17 grams.