The Skipping Rock

i was in san juan, province, argentina with my wife. We had just got down watching the a total eclipse of the sun. And so i spent a lot of time grabbing a rock,. feeling the weight of it, knowing how it felt. It looks like a vein of some type of ore or other mineral running through a larger chunk of rock. Looks like a great rock to skip, exactly. So, ok, i got it right the second time. No, it was both, but, but the skipping rock.