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Stone meteorite fragment. Close-up of a fragment of meteorite NWA 5429, a breccia stone Type L3-9 meteorite found in the Sahara Desert, Northwest Africa, in 2001. This fragment weights 4.4 kilograms and has a dark brown glass-like fusion crust, formed as the rock melted from the extreme heat caused by entering the Earth's atmosphere. Inside the iron content shows up with a rusty appearance (light brown). (KEYSTONE/SCIENCE PHOTO LIBRARY/DETLEV VAN RAVENSWAAY)