AFM-triangles (aluminium-iron-magnesium) showing phase equilibria in metamorphic rocks at different P-T circumstances (metamorphic facies). Dots represent mineral phases, thin grey lines are equilibria between two phases.
Abbreviations of mineral phases: and = andulusite; bi = biotite; chl = chlorite; cht = chloritoid; cd = cordierite; gt = garnet; ky = kyanite; opx = orthopyroxene; prl = pyrophyllite; sill = sillimanite; st = staurolite; stp = stilpnomelane; ta = talc
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