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Pure graphite is supposed to be less dense, lighter than a white quarts rock of the same size.  With Galena, it would be twice as heavy as a quarts rock of the same size.  Lead would be almost 4 times as dense as a quarts rock the same size.  With that, it points away from being graphite.  Since I'm no expert and there's all sorts of metallic looking specimens, especially when smaller and magnified, I can't hazard a guess other than its not graphite based on "it feels very heavy."

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