Calcic plagioclase under hydrothermal alteration may produce

Uralitization is the process of deuteric alteration of pyroxene (most commonly augite) to form amphibole (actinolite-tremolite). The alteration occurs during either late-stages of ...

Lower temperature (150–350°C) hydrothermal alteration of plagioclase typically leads to feldspar turbidity, particularly in calcic plagioclase, and widespread formation of second...

Sassuritization is a hydrothermal alteration process by which calcium-bearing plagioclase feldspar is altered to a characteristic assemblage of minerals called saussurite (typical ...