Yes! I have given many over the years. I prefer to give anthracite since it is hard and shiny and relatively clean. Put it in a plastic baggie so it does not mess up anything.
Fun fact… It is very difficult to light and won’t burn in a “normal” wood burning stove. If you have a good fire going you can toss in a couple of lumps for fun to see what happens. Nothing.
My high tech Lopi wood burner will light them off when I have a hot fire going.