Minerals/Gemstones WHAT IS IT?

[Eqnn]

Hello I just found a box of a bunch minerals and stones and have no clue what most of them are! They could be real or pieces of colored plastic, I do not know. Here is one, I have MANY others.

This one is different shades of tan to red browns

 

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[stdenis_jd]

needs a streak test...I'm inclined to say marcasite though

 

[DDancer]

What he said