Identify "peanut butter" stone?

[WhiteCross]

Howdy. This piece looks like jasper but I can't seem to find a match.
Roughly 18mm long x 9mm at the widest. Set in sterling, and Mexican:

 

[stracci2000]

I think it is "elephant skin" jasper.

 

[WhiteCross]

Outstanding, @stracci2000 !
Definitely the #1 candidate unless anyone can come up with a more likely suspect. Thank you!

 

[stracci2000]

@WhiteCross,
Here is a page with some more information.
A really interesting stone!

https://www.barlowsgems.net/coquina-jasper-cabochons/