> Some are much more knowledgable than me on woods,but I think I have the answer for you.
The wood you are seeing there,is probably buckeye burl like you said,but NOT in it's original form.
What you are seeing there is a piece of "stabilized" buckeye burl from a company called WildWoods.
They take woods of all species,and vacuum-treat them with various resins.
Think Dymondwood without the laminations,and you've got the idea,it's part wood,part plastic when complete.
Buckeye burl is a beautiful wood,but has many of the undesirable characteristics of amboyna,thuya,and other burls. It's light,soft-hitting,prone to cracking,likes to "move",and brittle.
These idiosyncrasies make the burls a difficult wood to work with in large enough pieces to make a forearm from. Some cuemakers refuse to use them except for inlays or butt sleeves for this reason.
The example you gave wouldn't be subject to those complications,it cuts like more of a plastic than wood.
Hope this helps you,Tommy D.