(Solved): how do you determine the oxide equivalent and oxide percentage? 1) Compute the ternary coordinates ...

1) Compute the ternary coordinates of the molecular proportions of the following minerals and plot them onto the triangle diagram provided. a) First, rewrite the mineral formula as oxide equivalents b) Then work out the proportions of the oxides \\( [(\\mathrm{Mg}, \\mathrm{Fe}) \\mathrm{O}],\\left[\\mathrm{Al}_{2} \\mathrm{O}_{3}\\right] \\), and \\( \\left[\\mathrm{SiO}_{2}\\right] \\) in the mineral. c) Finally, use the proportions (\\%) of these oxides to plot the mineral onto the ternary diagram. E.g. Sillimanite \\( \\left(\\mathrm{Al}_{2} \\mathrm{SiO}_{5}\\right) \\) can be expressed as oxide equivalents as \\( \\left[\\mathrm{Al}_{2} \\mathrm{O}_{3}\\right] \\). [ \\( \\left[\\mathrm{SiO}_{2}\\right] \\); that is a ratio of \\( 1: 1 \\), or \$$\begin{gathered} left[ \\ mathrm{Al}_2 \\ mathrm{O}_3 \\ right]=50 \end{gathered}$$ and \$$\begin{gathered} left[ \\ mathrm{SiO}_2 \\ right]=50 \end{gathered}$$