The Salzburg Cube (Wolfsegg Iron)

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http://imgur.com/LZOT3.jpg

 

The Salzburg Cube, is a small cuboid mass of iron that was found buried in Tertiary lignite in Wolfsegg, Austria, in 1885. It weighs 785 grams and measures 67 x 67 x 47mm. Four of its sides are roughly flat, while the two remaining sides (opposite each other) are convex. A fairly deep groove is incised all the way around the object, about mid-way up its height.Originally identified as being of meteoric origin, a suggestion later ruled out by analysis, it seems most likely that it is a piece of cast iron used as ballast in mining machinery, it is said to be a 20 million years old.