According to The origin of moldavites, the innervisioncrystals.com/fake-moldavite origin is a result of meteorite impact at Stuttgart (southwestern Germany), 14.800,000.
According to laboratory simulations and calculations, the meteorite’s diameter was between 500 and 1000 meters (1640 – 3200 ft.). Most likely, the meteorite originated from west-southwest with an acute angle of 30-50deg.
The impact of meteorite caused a huge crater of approximately 25km (15.5 miles) diameter. Ries Kessel. The meteorite broke into smaller pieces after the impact. The existence of a smaller meteorite with a diameter around 4km (2.5mi) is proof of this. Steinheim. Ries Kessel can be reached at a distance 30km (18.6mi). Scientists initially thought that Ries Kessel crater had a volcanic origin (leftover volcano calder). Coesite is a unique quartz variety found in the crater. It was formed after heavy smelting of rocks under pressure.
The meteorite penetrated Earth atmosphere at speed of 22 km per hour (13.7 mi./s). During his flight through space, the temperature reached 5 000 – 10 000degC (9,000-18,000degF; forward-facing area; pressure 500GPa).
The subsequent transfer of kinetic energies on the meteorite collision caused melting of the underlying rock and the meteorite as well as their catapulting up to the upper atmosphere. The melt became transparent and congelated in the atmosphere. Drops of the melted mix fell onto Czech Republic territory where they were washed off to become sediments. Current moldavites are based on this Tertiary Lacustral sediments. It is found in South Bohemia as well as the Moravian areas of Bohemian Moravian Highlands. They also surround Trebic and the river Jihlava. The impact angel determined the trajectory of meteorite droplets and the distance between them and melted moldavites was about 450km (280mi). Fall field is the name for the impact area of molted mouldavites.
Moldavites were later washed from localities to secondary areas.