Natural CORAL specimen LAVA mounting Please comment! NEED I.D.???

Hi everyone! Are there any CORAL COLLECTORS out there? I acquired this natural coral specimen, it's pretty big 13" x 11" (probably slightly larger) not including the mounting. I've done searches trying to find comparables (ie size, type, mounted similarly, would eventually like to figure out its value too) ... do you think it's from Hawaii due to the lava rock? Is this acropora ... or what specific kind of coral is it? I'm pretty clueless. (Not even sure what category to list this under, there's "Coral Jewelry" but this isn't jewelry.) I welcome your comments and insight!!!!! Thanks!