I have personally never seen it but this might help you.
Quoted from "The Art Of Blacksmithing"
"It was soft, yet tough. For instance, it could be bent double without breaking. Indeed, many farriers in the old days tested horeshoe nails by bending them across the forehead to determine softness."
"As with wood, pure iron had a sort of grain, a fibrous quality due to silica content, which influenced the method by which it was worked. These fibers became quite apparent when examining old pieces of wrought iron that had been exposed to the elements, or buried in some ancient warriors grave. These fibers may also be seen at the end of an iron rod which has been worked at too low a heat for the force of the hammerblows seperate them until the iron resembles the frayed end of a wooled tread. Making too sharp a bend , even when hot, weakens the fibers, so that old pieces have rounded corners where bent, and old anvils had a section of a corner rounded for forming bends."
There is more regarding it from the book but my fingers are tired. :D