Wow that is exquisite! I didn't know they had coins with moldavite. I'm a big fan of moldavite and do collect various pieces. The pressurized gas bubbles in the glass suggest they were liquid at a certain altitude within our atmosphere and by the time they hit the ground it was already semi solid when it hit the ground taking the shape of what it rested on as it finished to solidify, it shouldn't contain any earth material in the glass.