Hi leftee44
This sounds like the crank arm, which can also be metal.
The crank arm links the pedals to the front derailleur and large cogs, which, in turn, turn the chain and rear derailleur and rear cogs attached to the rear wheel.
You may have to replace the pedal as well in case any damage was done to the thread of the pedal when it broke.
When attaching and screwing crank arms and pedals in place, care must be taken to turn left and right crank pedals in the correct opposing direction so as not to dethread the the crank or the pedal.
Crank arms and pedals are standard universal fittings on most bicycles and can be bought at most cycle and cycle accessories shops or website such as (click here):
http://www.amazon.com/SR-Suntour-Crank-175mm-Black/dp/B000C14HO2/ref=sr_1_99?ie=UTF8&qid=1316878764&sr=8-99or:
http://www.amazon.com/GENERIC-Generic-170Mm-Diamond-Crk/dp/B005MHNGHA/ref=sr_1_111?ie=UTF8&qid=1316878817&sr=8-111
I hope this helps.
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