Moldavite, the melted silica of the Earth, 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. At approximately 77% silica it is softer than tektites of desert origin which allows for the deep, groundwater etching Moldavite is famous for. Nesměň Forest, Czech Republic. 1" x 1.18" x .5", 7.5 grams