• magmatic
  • During K-metasomatism of plagioclase several different types of myrmekite can appear: rim myrmekite wartlike myrmekite ghost myrmekite This is the initial stage of K-metasomatism in cataclastically-deformed magmatic plutonic rocks. (wikipedia.org)
  • A very important observation is that the maximum coarseness (tubular diameter) of the quartz vermicules shows a strong correlation with the Ca content of the plagioclase in the original, unreplaced, non-myrmekite-bearing magmatic rock. (wikipedia.org)
  • relative
  • In this particular case an irregular subtraction of Ca, Na and Al from deformed plagioclase happens which causes an imbalance in the relative amounts of residual Al and Si. (wikipedia.org)
  • shows
  • The illustration shows tartan-twinned microcline having completely replaced plagioclase. (wikipedia.org)
  • The resulting myrmekite also shows vermicules with constant thickness but unlike in the first case the vermicules formed in anorthosites can taper locally to the primary, non-quartz-bearing plagioclase. (wikipedia.org)