Meteorite Tektite Impact!!! Specimen (250 crt) 50 grams. 41mm X 37mm X 32mm 1.3/4 inch. Yellow/greenish with dimples. Libyan Desert glass or Great Sand Sea glass is an impactite, made mostly of lechatelierite. Location: found in areas in the eastern Sahara, in the deserts of eastern Libya and western Egypt. Fragments of desert glass can be found over areas of tens of square kilometers.