Translation of "plagioclase" into Icelandic

(Can we clean up ⁽⁺⁾ this sense?) (mineralogy) Any of a group of feldspar minerals that form a solid solution series from albite (sodium aluminum silicate) to anorthite (calcium aluminum silicate). The plagioclase feldspars are found in igneous, plutonic, and metamorphic rocks. They all have the triclinic-pinacoidal crystal habit, but only Albite commonly occurs in well crystallized specimens. [..]