Libyan Desert Glass Crystal - Height: 1 cm - Width: 1 cm - 25.7 g - (4)

4 pieces Libyan desert glass25.7 gram from the Libyan desert
5.7g - 5.6g - 5.8g -8.7 g
Collected in 2016
Meteorite impacts 26 - 29 million years
Please note
If any tax or customs in your country you will pay it not me
Tektites are fragments of terrestrial sedimentary rocks torn from the ground during a meteorite impact under the effect of pressure and intense heat.
On impact, the rocks melted under the effect of the shock are ejected at very high speed and can travel hundreds of kilometers.
During its ballistic trajectory, the viscous material will take its final shape and cool.
Note for example the spherical, ellipsoidal, dumbbell, drop, pear, tear, flat or swollen disc ...

The variety of shape of tektites results from the various forces applying to them.
For example, cohesion forces (for the agglomeration of viscous material), centrifugal forces (when the material rotates) and aerodynamics (friction force and resistance to movement) can be cited.
The trajectory of a tektite can be intra or outer. This will obviously have consequences on its final shape, entry into the atmosphere can cause cracks on the surface, kinds of grooves such as scratches