What if the whole of the Periodic Table were all rocks and metal? And what if it were created in 1987 by Jesus, he of the Roadside as a tribute to Guns ‘n Roses?
It is obviously a concept whose time has come, because there are several others around that attempt to knock out the non-metals and the non-rock:
Periodic Metal
Classic Rock Periods
Periodic Table of Rock Music
Chinese Periodic Table of Rock
Metal Chart