Oligoclase

Description

Oligoclase is a significant rock-forming silicate mineral within the plagioclase feldspar solid-solution series. Its chemical composition occupies an intermediate position between the endmembers albite (NaAlSi3O8) and anorthite (CaAl2Si2O8), characterized by an albite-to-anorthite molar ratio spanning from 90:10 to 70:30. As a component of the plagioclase group, oligoclase shares the characteristic crystallographic and physical properties inherent to this mineral family, serving as an essential crystalline phase in the study of igneous petrology and ceramic material science.