How can I obtain oxygen gas from plagioclase I would like to know if there is a possibility to decompose plagioclase to obtain oxygen gas to be used in a combustion reaction?

I know that oxygen represents $47\%$ of the weight of 1 mole of plagioclase (albite $\ce{NaAlSi3O8}$ – anorthite $\ce{CaAl2Si2O8}$), which equals to $\pu{130 g}$ out of $\pu{277 g}$, so it will be very nice if I could decompose plagioclase and obtain oxygen gas, but I don't know if that is possible or not?
Yes, I collect oxygen isotope data from plagioclase using the laser flourination method. To liberate the oxygen from the plagioclase, crystals are reacted with purified $\ce{BrF5}$. Then the plagioclase is hit with a $\ce{CO2}$ laser. Gasses are sent through a couple of cryogenic (liquid nitrogen) traps to filter, and then through a mercury diffusion pump to remove that nasty flourine.