I'm looking for this: Ashworld Crystal Sprite Overlaid
Which one is it exactly in the sprite doodad list?

I don't know what you're talking about, but my best guess is this:
> Sprites > Doodads > Ashworld > Doodad 9 or 10.

Ok I'll check that. it was supposed to make minerals look black?

Not sure about that, but the sprites I provided look like black minerals a little bit.