Currently, moldavites have been found in an area that includes southern Bohemia, western Moravia , the Cheb Basin northwest Bohemia , Lusatia Germany , and Waldviertel Austria.
Ninety-nine percent of all moldavite finds have come from the South Bohemian localities, one percent were found in South Moravian localities.
The colour of Moravian moldavites usually differs from their Bohemian counterparts, as it tends to be brownish. Taking into account the number of pieces found, Moravian localities are considerably less productive than the Bohemian ones; however, the average weight of the moldavites found is much higher.
Its properties are similar to those of other types of glass, and reported Mohs hardness varies from 5. Moldavites can be distinguished from green glass imitations by observing their worm-like inclusions of lechatelierite.
The total amount of moldavite scattered around the world is estimated at tons. There are three grades of moldavite: All three grades can be told apart by their appearance.
The regular grade pieces are usually darker and more saturated in their green colour, and the surface is seen as closely spaced pitting or weathering.
This type sometimes appears to have been broken apart from a larger chunk. The museum grade has a distinct fern-like pattern and is much more translucent than the regular grade.
There is usually a fairly big difference in the price between the two. High-quality moldavite stones are often used for hand-crafted jewellery.
The association researches, exhibits and promotes moldavites and other tektites around the world and has member geologists from more than 30 countries worldwide.
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Michal Pavlata on loan from Jablonec. Jan Stibor on loan from Teplice.