Abstract: Sub-greenschist facies metamorphism has produced unusual subcalcic, Fe-rich actinolitic amphiboles in meta-dolerites from the Glenrock Station area, NSW. They show edenite, riebeckite, ferri-tschermakite and Ti-tschermakite coupled substitutions. Their high Fe content is attributed to high a_Fe2+ and a_Fe3+ in the fluid phase produced during the breakdown of clinopyroxene, hornblende, magnetite, and ilmenite. The high a_Fe2+ led to Fe led to Fe^2- occupying the B site, resulting in the formation of subcalcic amphiboles. Variation in a_Fe²⁺, a_Fe³⁺, a_Mg, a_Si, a_Al, and a_Ca, in different domains resulted in the crystallization of chemically inhomogeneous amphiboles.