Jet

Jet Black Amber, Jeat, Agath, GagateSuccini Nigri, Carbo Fossilis, Lapis Thracius Museum Museorum, Valentini, 1704 Jet (Photo by Geni, Wikimedia) Minerological name: Lignite (variety)Jet is similar to Coal, but harder, with a deeper color, and higher luster. Jet began to form about 180 million years ago. Other stones allied to or classed with Jet:1. Black…