Description: Tektite formed by an asteroid impact in southern Germany 14.7 million years ago. Moldavite is the only extraterrestrial substance that has gem quality, making it perfect for jewelry. Tektites are the union of aluminum oxide and silicon dioxide glasses, among others, with an amorphous crystalline structure.
Mohs Hardness: 5.5
Chemical formula: SiO2(+ Al2O3)
Origin: Vltava River Valley, South Bohemia (Czech Republic).