Splashform Teardrop Indochinite Tektites Set (you get all shown in the set)
Meteorite Impact glass
Bao Loc, Vietnam
700,000 years old
Originates from meteorite impact into the earth at high velocity, where the molten strewn material then becomes natural glass when air hardened.
Size: See Photo for scale. They are an Average of 3-6cm normally when found.