Normandite
Chemical formula: Na<sub>2</sub>Ca<sub>2</sub>(Mn<sup>2+</sup>,Fe<sup>2+</sup>)<sub>2</sub>(Ti<sup>4+</sup>,Nb<sup>5+</sup>,Zr<sup>4+</sup>)<sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>O<sub>2</sub>F<sub>2</sub>
Cabinet No. 40
Chemical formula: Na<sub>2</sub>Ca<sub>2</sub>(Mn<sup>2+</sup>,Fe<sup>2+</sup>)<sub>2</sub>(Ti<sup>4+</sup>,Nb<sup>5+</sup>,Zr<sup>4+</sup>)<sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>O<sub>2</sub>F<sub>2</sub>