Moldavite is the naturally water-etched result of a meteoritic impact in southern Germany that occurred about 14.7 million years ago, forming the Nördlinger Ries Crater. It is approximately 77% silica. This one does exhibit a higher pitched "ping" when tapped, aligning with the "Angel Chime" concept. Besednice, Český Krumlov District, South Bohemia, Czech Republic. 10.3 gms. 1.5" x .25" x 1.75" Check It Out On YouTube