Hi there I found this globular tooth on the bank of the Dnipro River,
Kherson region, Ukraine. Dimensions: 31 mm high, 26-27 mm wide.
In profile, the shape is a little close to triangular with rounded corners.
I suspect it may be a tooth of ichthyosaur(Tholodus schmidi),
Some megalodon or crocodile. The rock material is unknown, but appears to contain a significant silicon content.
Hardness greater than 6 (does not scratch with a good knife). An ichthyosaurus vertebra (possibly) was found nearby.
The material of the "vertebra" is more fragile than the tooth.
The outer layer consists of small particles similar in size to the sand.