Dislocation Dissociation in Chain Silicates

  title={Dislocation Dissociation in Chain Silicates},
  author={Werner Skrotzki},
Many rock-forming minerals are chain silicates. The most abundant are pyroxenes (single chain silicates) and amphiboles (double chain silicates). Orthopyroxenes and Ca-rich clinopyroxenes together with olivine constitute the ultrabasic rocks (peridotites and pyroxenites), rocks dominating the upper mantle. Ca-rich clinoamphiboles together with feldspars constitute amphibolites, rocks existing at higher levels of the lithosphere, in the lower crust.