Yup, as I said in post #20 and Detlef in #29, this fibrous look is very common.
And it hardly ever is rhino. While there are additional indicators which can lend a hint if you're willing to gamble, one really needs to look at the end-grain (as in post #8) to ascertain any identification.
This is an old fad which still gets purported by dealers to increase sales...
Regards,
Kai