Andradite

Formula: Ca3Fe3+2(SiO4)3 Andradite is relatively rare, but is the most abundant of the Garnet Group minerals. It occurs in miarolitic cavities in nepheline syenite, in marble xenoliths, and associated skarn contact zones. Crystals are generally rhombic dodecahedrons, with colours ranging from yellowish-green to dark olive-green. Yellow octahedral crystals such as...