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Tektites are usually translucent and occur in a range of colors from green to brown. Their surfaces are usually uneven or rough, with a distinctive lumpy, jagged, or scarred texture. Tektites do not contain the crystallites found in obsidian. They may, however, have characteristic inclusions of round or torpedo-shaped bubbles or honeylike swirls.
... found in the Egyptian western desert
tektite (from the Greek tektos, meaning molten), a natural black, dark green, or dark brown glassy stone, resembling the volcanic glass obsidian, that may possibly be of extraterrestrial or meteoritic origin. Tektites, which occur in four large associations of distinctly different ages throughout the world known as strewn fields, are similar to Libyan Desert glass in that both substances are composed chiefly of silica (silicon dioxide); the silica content of tektites ranges from 68-80 percent whereas that of Libyan Desert glass is approximately 98 percent. Both tektites and Libyan Desert glass are characterized by etched, pitted surfaces, which in the case of some of the silica glass may have been obscured by the scouring action of the fierce Saharan winds.
The concentric features are intriguing, (eruption?, mini-impact?) [attachment=13686]
... from the info you included this must be Tektite
Any ideas what is the outer layer? it's like crust and the inside is clear when you turn it against the light