Roumaite
Wzór chemiczny: (Nb<sup>5+</sup>,Ti<sup>4+</sup>)(Ca,Na,☐)<sub>3</sub>(Ca,REE)<sub>4</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>(OH)F<sub>3</sub>
Cabinet No. 40
Wzór chemiczny: (Nb<sup>5+</sup>,Ti<sup>4+</sup>)(Ca,Na,☐)<sub>3</sub>(Ca,REE)<sub>4</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>(OH)F<sub>3</sub>