plagioklaaseihin
Plagioclase is a major group of feldspar minerals within the plagioclase series, tectosilicates characterized by a complete solid solution between albite and anorthite. The series ranges from albite (NaAlSi3O8) to anorthite (CaAl2Si2O8), with intermediate members such as oligoclase, andesine, labradorite, and bytownite.
Crystal structure and properties: Plagioclases crystallize in a tectosilicate framework and show two good cleavages at
Occurrence: Plagioclase is a dominant mineral in many igneous rocks, particularly granites, diorites, and basalts. It
Identification and significance: The plagioclase composition is used to classify igneous rocks along a felsic–intermediate spectrum.
Notes: Plagioclase is a common crustal mineral and an essential mineral in petrology for understanding rock