Have you ever picked up a really interesting rock and wondered what it was and how it was made? Well, I have, and still do. Each rock tells a story about its creation: when it was made, how it was made, where it was made, and how it got to its finding spot. As I learn more about rock creation, I become interested in all rocks, even the plain ones.

One rock that is definitely not plain is our state gemstone, the Lake Superior agate. While visiting my son and his family in Omaha last week, my granddaughter and I found a Lake Superior agate - she is only 18 months old but spotted this tiny li...