Unknown Slab

[jungliston1]

Hello all, picked up this slab at a swapmeet. Any ideas as to what type of rock or mineral? Does not have any magnetism. Thank you for the help.
Edward M.

 

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[stdenis_jd]

streak and hardness tests?

 

[jungliston1]

Hello all, streaked grayish black on black parts and no streak on gold colored parts. I was able to scratch it with a Leatherman Tool. Thank you for the help.
Edward M.

 

[stdenis_jd]

no magnetism and that colored streak tells me it is likely pyrite/marcasite (iron sulfide). Problem is the hardness...it shouldn't be scratched by a leatherman tool, that type of steel should only be 5-5.5 or so as far as I know unless you used the file instead of the knife. The file will be 6.5, pyrite & marcasite are 6-6.5

 

[jungliston1]

Hello all, here is the scratch test, marks to left and right of part I used to scratch the rock. Thank you for the help.
Edward M.

 

[Eu_citzen]

Chalcopyrite in host rock?

 

[smokeythecat]

A good guess would be pyrite or chalcopyrite, which is essentially pyrite with copper added to it in the molecular mix.