I have some flint that I slabbed and polished. It's beautiful, earthtone swirls with reds and yellows blended in as well. Holding it gives me a very peaceful feeling. Yourself?
The city I live in is divided by the Flint River, named for the flint the natives used for tools and weapons before the Europeans arrived. This type of flint (for me) is good for motivating, for cutting ties, and making things happen. It is a bit intense, but there is another type of flint found in Poland (banded flint) that seems much more gentler: http://www.wewrapitup.com/pobaflca4.html