moldavite
/ˈmɒldəvʌɪt/Geology
noun
The substance, resembling obsidian, of which tektites from the strewn field of Bohemia and Moravia in the Czech Republic are composed.
Origin
Late 19th century; earliest use found in Albert Chester (1843–1903). From German Moldawit from Moldau, the name in German of the Vltava River in the Czech Republic + -it.