Why garnet occur in some medium-grade metabasalts but not in others in the same field area as in Review Question 9? Sketch an triangular chemographic diagram with at the top, on the left and on the right x-y-z x y z (as in Figure 24-2). Suppose you wanted to project a mineral with the formula from the xy2z2 mineral to the pseudo-binary. What would be your formulas for calculating and and x3y y-z y' z', where would plot? Compare the plot point mathematically and graphically. xy2z2 Problems 1. Given the following mineral compositions (Fe is Fe+2 unless indicated): Staurolite (St) (Fe,Mg)2Al9O6[(Si3Al)O16](OH)2 Chloritoid (Ctd) (Fe,Mg)2Al4O2[Si2O8](OH)4 Anorthite (An) CaAl2Si2O8 Glaucophane (Gln) Na2Mg3Al2[Si8O22](OH)2 Vesuvianite (Ves) Ca10(Fe,Mg)2Al4[Si2O7]2[SiO4]5(OH)4
Why garnet occur in some medium-grade metabasalts but not in others in the same field area as in Review Question 9? Sketch an x-y-z triangular chemographic diagram with x at the top, y on the left and z on the right (as in Figure 24-2). Suppose you wanted to project a mineral with the formula xy2z2 from the mineral x3y to the y-z pseudo-binary. What would be your formulas for calculating y' and z', and where would xy2z2 plot? Compare the plot point mathematically and graphically. Problems 1. Given the following mineral compositions (Fe is Fe+2 unless indicated): Staurolite (St) (Fe,Mg)2Al9O6[(Si3Al)O16](OH)2 Chloritoid (Ctd) (Fe,Mg)2Al4O2[Si2O8](OH)4 Anorthite (An) CaAl2Si2O8 Glaucophane (Gln) Na2Mg3Al2[Si8O22](OH)2 Vesuvianite (Ves) Ca10(Fe,Mg)2Al4[Si2O7]2[SiO4]5(OH)4
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