Help with Info on Legendary Artifacts?

This may be some dumb questions about some legendary artifacts I’ve been seeing. Watching some BL3 YouTube creators play and I’ve seen artifacts that are like a cross/plus shaped.

Are these any different from the legendary artifacts that share the same shape as white, green and blue artifacts? Is there a certain way to get them?

Just trying to figure out if I’m doing something wrong or my rng is just trash.