Episyenite Episyenite (or epi-syenite) is a term used in petrology to describe veins, pods, or lenses of rock originally rich in silicon dioxide (SiO2) from which quartz has been severely depleted. This is often accompanied by strong enrichment in potassium and rare earth elements, leaving the altered rock a distinctive brick red color, or by albitization (enrichment in sodium), leaving the altered rock a conspicuous white color.
Episyenite Episyenite (or epi-syenite) is a term used in petrology to describe veins, p,ods, or lenses of rock originally rich in silicon dioxide (SiO2) from which quartz has been severely depleted. This is often accompanied by strong enrichment in potassium and rare earth elements, leaving the altered rock a distinctive brick red color, or by albitization (enrichment in sodium) leaving the altered rock a conspicuous white color.