Type of Materia based on Gear Type

[Limecat]

I get Heaven's Eye materia from peridot/tourmaline all the time. o.O

I hate it cause I'm after Savage Might/Savage Aim. xD

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.