Mystery rock 5

[arnofarrell]

Found with 3 and 4 in Arizonia.

 

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[Eu_citzen]

Streak test? Psilomelane, hematite come to mind.

 

[arnofarrell]

I have never done a streak test. What does that entail exactly?

 

[rock]

Possible Slag chunk. Rub it on a piece of scrap tile and see if it leaves a color on the tile.

 

[arnofarrell]

I will go to my shed and see if I can find some tile. Thanks.