Almost everyone had a specimen of gypsum or selenite. Not suprising since the class had gone to the Alabastine Gypsum Mine for a field trip. We had a lot of limestone and granite and marble, some chert, and a couple chunks of concrete. A few nice agates and fossils rounded it off. Being able to show them real life examples of the shapes they had been studying was exciting.
Second graders are great fun to watch as concepts connect to reality.
I'm filing this trip report in hopes it will inspire others to find a local school and share their expertise and collection. We all have a responsibility to make sure there is another genration of Rockhounds.