This is a natural specimen of Moldavite from the Moldau valley in the Czech republic.
1.2 cm x 1.2 cm approx
Comes in a display case.
Moldavite is a member of the Tektite group of natural glasses formed from interplanetary collisions. From the Greek word tektos, meaning "molten," Tektites are glassy mixtures of silicon dioxide, aluminum oxide and other metal oxides with an amorphous crystal structure. Unlike other Tektites from around the world which are tar black or brownish-black, translucent Moldavite is a deep forest green and is the only variety suitable for cutting and faceting as a gem. [Simmons, 261][Simmons/Warner, 21]
This beautiful stone is rare, found only in Czechoslovakia, and is named for the area in which it is found, near the Moldau River (called the Vltava in Czech). While scientists differ in theories regarding Moldavite's origin, nearly all agree its formation coincides with the crash of a large meteorite approximately 14.8 million years ago in what is now the Bohemian plateau. The rock metamorphosed by the heat of impact created a strew field of Moldavite in the two, mostly rural, areas of Bohemia and Moravia. Farmers often turned up the stones when plowing their fields, while other specimens worked their way to the surface after spring thaw or heavy rains in the fall. More recently collectors have "mined" for gem grade and museum quality specimens by sifting and digging through loose sands and gravels. [Simmons, 261][Simmons/Warner, 21-23]