Here is a museum-quality specimen of Moldavite. It is green in color and is quite translucent - difficult to capture in my photograph.
Moldavite is a green vitreous silica projectile rock formed by a meteorite impact in southern Germany (Nördlinger Ries Crater). It is a type of tektite. Zippe first used the term "Moldavite", derived from the Moldau river in Bohemia (Czech Republic), from where the first described pieces came.
The current consensus is that moldavites were formed about 14.7 million years ago during the impact of a giant meteorite in the present-day Nördlinger Ries crater. Splatters of material that was melted by the impact cooled while they were actually airborne and most fell in Bohemia.
Museum grade Moldavite is much more translucent than the regular grade. It is used as an investment and each year the value goes higher as there are less and less to be found. High-quality moldavite stones are often used for hand-crafted jewellery.