What is essexite in geology ?
Essexite : definition
Essexite is a grainy, undersaturated, dark gray plutonic rock composed of plagioclase (andesine and labrador), nepheline, augite and brown amphibole (barkevicite), sometimes of biotite, titanite and rarely of orthoclase or analcime. It is also sometimes referred to as feldspathoid monzodiorite and monzogabbro.
It is a rare rock accompanying gabbros and theralites in basic complexes. Its volcanic equivalent is tephritis.
It is a rare rock accompanying gabbros and theralites in basic complexes. Its volcanic equivalent is tephritis.
