This evening in Monterey, I went to a local restaurant called Lalla's to meet with two cousins and my Aunt. There are smooth dark stones around the restaurant grounds, and I selected this one that fits into my hand perfectly.
One of my cousins wanted me to photograph it "enjoying the fireplace", and she set it on its edge. Measures approx 2 3/4" long and is a soft gray tone.
Here I am with the rock enjoying the fireplace. See how nicely it fits my hand?