Where to find flint or quartz?

Ok, so when I go down to the beach I see lots of rocks and pebbles. Today I found coal and some charcoal from the pier that burned a few months ago. So I was wondering if I can find flint or quartz there for my (material) n steel lighter? I have steel, tinder, wood and coal, now that's the only thing left. So can I find flint or quartz there, or where? Where did you find them? Anything help is appreciated.