Tags: Chemical Substance, Mineral.
Cervandonite is a rare arsenosilicate mineral. It has a chemical formula (CeNdLa)(Fe3+Fe2+Ti4+Al)3SiAs(SiAs)O13 or (CeNdLa)(Fe3+Fe2+TiAl)3O2(Si2O7)(As3+O3)(OH). It has a monoclinic crustal structure with supercell (Z=6) the crystal structure was established as a trigonal subcell with space group R3m and a = 6.508(1)Ǻ c = 18.520(3) Ǻ V 679.4(2) Ǻ3 and Z=3.