Each fibrous structure at magnification on end grain looks like a circle with a dot in the middle, rather like orange skin to look at.
Other than that I dont know of any test.
Much buffalo, goat & antelope horns can also be fiberous & often sold by unscroupolous dealers as Rhino horn. Especialy if of unusual coloring.
But magnification of end grain when visible reveals the truth.
I read lots but to be able to truly "see" it I had to handle authentic examples first.
Spiral
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