Alkali feldspar The alkali feldspar group are those feldspar minerals rich in the alkali elements like potassium and sodium. The alkali feldspars include albite, anorthoclase, microcline, orthoclase and sanidine. Wikipedia https://en.wikipedia.org/wiki/Alkali_feldspar Added to support Critical Zone Observatory (CZO) data use cases. ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables.