[QUOTE=katana}. Its been mentioned before that horn has tubular forms in its cellular structure which are noticeable on the 'end grain'. Overall the posted pics do have a wood grain 'look' but I think there is some translucence and some 'evidence of the 'tubular' structure.[/QUOTE]
Looks like dyed wood to me, all timber is tubular & fiberous in structure.
What you call translucence looks like light reflection to me.
Spiral
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