Darwin Glass Tektite, from Darwin Crater, Tasmania, Australia (No.002)

Tektites are small pieces of natural glass made from terrestrial debris ejected from the craters caused by meteorite impacts.

The name Tektite comes from the Greek word (tēktós) meaning molten. Tektites can range from a few millimetres to centimetres in size.

They can vary in colour from almost clear, green or dark brown and black. Shapes may vary too, spherical (circle), elliptical (egg shaped), lenticular (eye-like shape), teardrop, dumbbell (long with rounded ends), disk and button shape.