Is there any such thing as a fake coticule?

The coticule I received today is so regular, so homogeneous that it has me wondering. Either it's the kosherest kosher coticule or it's some sort of synthetic stone made to look like a coticule in color and with the tradiitional slate backing.

I'm at the office now so have yet to see if it makes a slurry and see how it hones.

It's also a touch darker in color than what I'm used to. More golden-mustard-colored than cream-colored.

I have my fingers crossed.