Fulgurite - Sand hit by lightning. This picture is not Fulgurite by the way.This is a stick with wet sand on it.Fulgurite is usually found in the ground where lightning has struck and is usually very small glass tubules.
8. Quarry Park and Nature Preserve in Waite Park is another great place to explore the remains of Minnesota's mining industry. With swimming quarries, scuba diving, and rock climbing as popular activities, this is another one of MN's favorite previously industrial sites. The quarries are former mining sites of Saint Cloud Red Granite, which can be seen in some of Minnesota's iconic buildings including The Landmark Center and the James J. Hill House in St. Paul.