Weight : 5.6 gram.
Length : 38mm
Origin : Czechoslovakia
Age : 14.7 million years.
Moldavite is an olive-green or dull greenish vitreous substance possibly formed by a meteorite impact in Southern Germany (Nördlinger Ries), which would make it one kind of tektite.
In 1900, F. E. Suess pointed out that the gravel-size moldavites exhibited curious pittings and wrinkles on the surface, which could not be due to the action of water, but resembled the characteristic markings on many meteorites. Boldly attributing the material to a cosmic origin, he regarded moldavites as a special type of meteorite for which he proposed the name of tektite. However, for a long time, it was generally believed to be a variety of obsidian. Because of their difficult fusibility, extremely low water content, and its chemical composition, the current overwhelming consensus among earth scientists is that moldavites were formed about 14,700,000 years ago during the impact of a giant meteorite in present-day Nördlinger Ries.
Splatters of material that was melted by the impact cooled while they were actually airborne and most fell in Bohemia. Currently, moldavites have been found in an area that includes southern Bohemia, western Moravia, the Cheb Basin (northwest Bohemia), Lusatia (Germany), and Waldviertel (Austria). Isotope analysis of samples of moldavites have shown a beryllium-10 isotope composition similar to the composition of Australasian tektites (australites) and Ivory Coast tektites (ivorites). Their similarity in beryllium-10 isotope composition indicates that moldavites, australites, and ivorites consist of near surface and loosely consolidated terrestrial sediments melted by hypervelocity impacts.
The chemical formula of moldavite is SiO2(+Al2O3). Its properties are similar to that of other types of glass, and its Mohs hardness is 5.5. Moldavite can be transparent or translucent with a mossy green color, with swirls and bubbles accentuating its mossy appearance.