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It's called real reef rock. Except yes it's not real rock. But I have it in my 34 gal with black sand and it looks great! My 75 gal has regular live rock and white sand and the corals don't pop as much (in my opinion) as they do in my smaller tank. I'd post a pic but the app hasn't been letting me. If you go to my photos you can see pics of both tanks. I have more corals in them now though.
This rock doesnt have corraline on it. The purple comes from a dye they use to make it purple. Im not saying it wont grow coralline on it if its seeded. I have 25lbs of it in my 75 gal and 70lbs of fiji and it looks great.