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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
The concentric features are intriguing, (eruption?, mini-impact?) [ Invalid Attachment ]
... 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