Just because you acknowledged it, doesn't mean you're the only one who got it
Try scraping it on other minerals or something, maybe you can figure out it's hardness and use that to help identify it.
I'm not sure if this is good enough, but it appears to easily scratch the side of a plastic disposable lighter and not glass.
Try seeing what can scratch it also.
powerlevel mining then buy iron and powerlevel smithing with cannonballs
its just coallooks exactly like the coal i find dug up in my backyard
Too shiny for coal.
I've seen coal samples IRL, some of the grades can be very shiny
Sounds like mica
Pretty sure it's anthracite coal. Anthracite coal is shiny, it also has the same streak color.