Type of Materia based on Gear Type

[Ghishlain]

I'm merely guessing here, but that may be because of the PIE since MP isn't a mage-exclusive stat. OP might be using blue-gem gear to SB instead of green.

I think this right here, I generally SB Turquoise / Aquamarine accessories, so that might account for the difference.

What I can recall getting from those:

Spell Speed
MND
VIT
PIE
Crit
Det
And of course, random elementals.