I have this big rock (about 10 lbs) from a beach in North-Western Europe. It looks pretty much like a regular rock, but when you look closely it has maybe 200 small red spots. And when you look really closely, you can see it looks like tiny red crystals. Does anyone here know what kind of rock this might be? Nobody has been able to tell me anything about it so far. (the red spots look lighter in the picture than they actually are, and the tiny crystals aren't really visable on the picture either).