Lil Red Lopez had a solid chin, considering how leaky his D was. Sanchez hit him with 4,000 clean shots in their two fights, and in both fights Lopez was never down - stopped on his feet both times.
I wouldn't call Beterbiev's chin granite either, but he's only been down and hurt from one guy, and Johnson punches like a mule. Gvozdyk can clearly bang, too.
Devin Haney- a perfect blend. He punches with the force of a thousand feathers and was only slightly wobbled by 59 year old Linares. Something special that kid.
Gerald McClellan had a combination of granite chin (being able to take flush hits from Julian Jackson) and scary power. He was only stopped when he went down on his knees from brain damage after taking too much punishment from Benn. Sung Kil Moon should also qualify.