What is this Rock Specimen?

My SWAG is that it is pyrite in a black shale. Red could be another Iron mineral.

Where did it come from? that would be a start.

Im not sure Ive had it for sometime and just became curious as to its origin… I doesnt seem like a slate as its heavy and doesnt have the slightest fracture points, and seems to be overall crystalline in origin. Im not geo-know-anything. All I do know regarding its origin is its from the western states. (lol) Blow up the image to original size. The lighting almost makes it appear striated like a slate, I may need a better picture.

Should i do like a streak test? If so then what material? What are the host rocks typically associated with pyrite? Its definitely a unique specimen. :)

it is a lackadaisical crustacean…. sorry, I couldn’t help myself. lol