![Old JET marbles](http://thetoyboat.com/cdn/shop/products/eb6f3b91-9081-6548-be4f-56d1508907d8_1024x1024.png?v=1593625417)
Old JET marbles
$ 1.00
Jet is lignite, a gemstone. It is a mineraloid, a mineral-like material. This is derived from decaying wood that has changed under extreme pressure. This mineraloid was mixed with glass to create these old marbles.