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Early in the morning on July 16, 1945, the first atomic bomb blast was detonated at the Trinity Site. The resulting fireball that scorched the desert formed a depressed crater 800 yards in diameter, glazed with a light olive green, glass-like substance where the sand had melted and solidified again. Chemical tests have confirmed that it is nearly pure melted silica with traces of Olivine, Feldspar, and other minerals which comprise the desert sand. Thus, the first man-made mineral called Trinitite was created and has remained relatively difficult to obtain.
Each specimen has the light olive green, glass-like, fused top surface, with interesting rounded form. The bottom of each piece exhibits the rough texture of the sandy desert surface, which remained untouched by the blast. While the Trinitite was highly radioactive in 1945 when it was formed, more than 60 years have passed and at the present time, radioactivity is virtually zero.