'Ivory' in the Bible

And the king maketh a great throne of ivory, and overlayeth it with refined gold;

for a navy of Tarshish hath the king at sea with a navy of Hiram; once in three years cometh the navy of Tarshish, bearing gold, and silver, ivory, and apes, and peacocks.

And the rest of the matters of Ahab, and all that he did, and the house of ivory that he built, and all the cities that he built, are they not written on the book of the Chronicles of the kings of Israel?