Fulgurite

A Fulgurite or also known as a "Living Act Of God" is a rare item needed to bind Death.

Background
Fulgurites are very rare due to only being created when lightning hits the sand on the right spot, a crystal forms. After Crowley slips them the ritual to bind Death, Bobby goes looking for the materials. He finds one, which was recently bought by a rich couple. At the mansion, Sam grabs the crystal from its case, and puts it into a bowl where he smashes it into dust.

Appearance
Meet The New Boss