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How big are they Steven??
If they're big enough, cut one in half length ways. If you see a cross hatched pattern of crystal growth (Widmanstatten Lines) after etching and polishing, then it's definitely a meteorite. But some don't have the pattern....it's due to nickel content in the rock.
It's actually very hard to tell what they are from those piccies. Where did you find them?? If they're terrestrial, they're most likely (from their colour and the weight you described) a nickel-iron ore, or an ore of some other mineral of that colour such as chromite, chromite-nickel, chromite-vanadite and/or one of the rare earths.
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