I just examined on a whim a Shaft of Mahogany, and there was a typo on it.
The Shaft is named correctly, but it's description says the following:
"This shaft is used in the making of iron weapons."
Mahogany Shafts are used in the making of adamantium melee weapons on Layo.
Note: Shaft of Mahogany is a different item than Short/Long Stave of Mahogany, which are used in the making of corresponding bows of mahogany.
Edit: Might be good to check the Shaft of Oak, Shaft of Hickory & Shaft of Yew as well for similar typos.