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[Jeramiah]

Some key points:
Non magnetic
Great conductor
Hear distributes doesn’t leave any dark areas
Heavy
Scratches glass

[Forrestblyth]

Perhaps an earth metallic ore

One test to be certain if extra terrestrial in nature is as follows. but you would have to slab a section. You would then be certain if present

Widmanstätten patterns are distinctive, interlocking patterns of crystals that can be observed on the polished surfaces of iron meteorites

[Pete Richards]

If it's non-magnetic, it is not an iron meteorite.

Consider the possibility that it is a partially-refined metal - a smelting product - rather than a natural rock or mineral.

[Bob Carnein]

That looks synthetic (man made) to me.

[Jeramiah]