Were claw originally bone and then encased in adamantium?

That's a common misconception! Wolverine's claws are not bone encased in adamantium.

Here's the breakdown:

* Wolverine's claws are actually bone. They are an extension of his skeletal structure, much like the claws of a real-life animal.

* The adamantium is a coating. It's a near-indestructible metal that was bonded to Wolverine's bones, including his claws, during a Weapon X experiment.

So, while the claws are part of his skeleton, the adamantium is a separate material that covers them.