Lonnie Lincoln (Earth-4678)

Lonnie Lincoln was a child born in Harlem when he exposed himself to Diox-3. The exposition to this toxin changed Lonnie's phisiology, transforming his skin on a stone-like tissue, making him invulnerable. When grown up, he became the feared gang leader under the moniker Tombstone. He eventually met and fought Spider-Man many times over the years, with the Webhead becoming one of his biggest foes.

Source

 * https://marvel.fandom.com/wiki/Lonnie_Lincoln_(Earth-1048)