Woody,
There are two types of olive wood (may be more??), South African Olive (Wild Olive), Olea Laurifolia and the stuff from Italy, Spain and the stuff that is supposed to come from the holy land but in reality has been grown in Southern Italy and taken a TNT trip to Bethlehem, Olea Europea.
South African Olive wood is also known as Black Ironwood and is much denser than Olea europea. Dont like the South African stuff myself, its tough as old boots, unsurprising as local name is ironwood!!