Probably the most famous metallic mineral is Pyrite, or Fool's Gold. Hematite, which is often used in jewelry, and Graphite, which is often used in pencil lead, are also rather well known metallic...
Basically just by looking at it. Is the mineral shiny and reflective? Then it's metallic. Is it more dull and not really reflective? Then it's non-metallic. Of course, it can be trickier than it...
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