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The Tucson Ring meteorite is a 
brezinaite
Brezinaite, discovered in 1969, is a rare mineral composed of chromium and sulfur. It is found in meteorites, such as the Tucson Ring meteorite (Irwin-Ainsa meteorite), its type locality. It was also found in the New Baltimore meteorite and th ...
meteorite
A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or Natural satellite, moon. When the ...
fragment, first described by Bunch and Fuchs. It was reported as one of several masses of virgin iron found at the foot of the Sierra de la Madera and transported to the plaza of Tucson, Arizona circa 1850, where it was used as an anvil in a blacksmith's shop.
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