That wasn't my experience. I used two Invicta samples which say "flame fusion" on their casebacks, an Orient Mako (mineral), and an Ocean 7 LM-6 (sapphire). Only sapphire had a "tiny" footprint.
You can actually feel the difference between mineral and sapphire by stubbing your thumb across them. Sapphire is "stickier", offering more resistance to your thumb gliding across it; mineral is more sllippery, offering less resistance to your sliding thumb, which makes sense in how a drop of water reacts when it hits their respective surfaces. Of course that has nothing to do with hardness, just in telling the two apart.