Tectite from meteorite impact, China
A tectite, a piece of natural glass formed during a meteorite impact in Zhanjiang, China. If you look at it really closely with good light it actually has some areas that look dark green rather than black. It is mounted on a cream coloured base.
7/8 inch (2.2 cm) wide, 5/8 inch (1.6 cm) deep and 1/2 inch (1.3 cm) tall.