Laddy, yeah, I got pretty much all the materia (missed the Magic Plus in Corral Valley, and the Added Cut on the Great Glacier, I hated the Glacier) because I am meticulous too. It even makes me cranky that I only got one out of four Enemy Skill Materia with everything.
Elly, I didn't have a second memory card for my PS2 because the first one just died when I started playing FFVII. That meant I had only 3 slots, with one I set aside with Aeris still alive just for old time's sake. Since I didn't know I lost the Materia until later, I had already saved over anything pre-Northern Crater besides the Aeris file. Hence the sad.

I also found that my Underwater materia was one of the one's deleted, but I managed to mime my way through the Emerald Weapon battle just in time.

Thanks to you both, I needed to vent cause I am a total perfectionist about these things.