ACF-triangles (aluminium-calcium-iron) 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.
Mineral abbreviations: act = actinolite; cc = calcite; chl = chlorite; di = diopside; ep = epidote; glau = glaucophane; gt = garnet; hbl = hornblende; ky = kyanite; law = lawsonite; plag = plagioclase; om = omphacite; opx = orthopyroxene; zo = zoisite
<a href="//commons.wikimedia.org/wiki/User:Woudloper" title="User:Woudloper">Woudloper</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>