Any idea what the black stuff is?

[goldnuggets]

 

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[goldnuggets]

View attachment 2022674

Any idea what that black stuff is? Found it in a river and decided to bring it home

 

[NJearthman]

Looks like hornblende

 

[uhfradarwill]

Let me tell you a story about a detectorist, a man named Jed.
He was a poor mountaineer who barely kept his family fed.
Out one day swinging in some grass.
..........