English Oak was seen to be sacred by both the ancient Celts and Slavs and used to light fires ritually within ceremonies (e.g. Beltaine, Samhain) at at times of distress. Even though Oak is a hard wood, it is possible to tempt an Ember using Oak with the Bow Drill. You need to ensure that the Oak is very dry and it may take some time to get used to using it, and it doesn't always work. You do need to apply as much downward pressure as possible, as Oak polishes easily. Here is a short film clip demonstrating Oak on Oak.