Mantienneite
Chemical formula: (H<sub>2</sub>O)<sub>2</sub>Mg<sub>2</sub>(Al<sub>2</sub>Ti<sup>4+</sup>)(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>2</sub>(H<sub>2</sub>O)<sub>10</sub>ยท4H<sub>2</sub>O
Cabinet No. 40
Chemical formula: (H<sub>2</sub>O)<sub>2</sub>Mg<sub>2</sub>(Al<sub>2</sub>Ti<sup>4+</sup>)(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>2</sub>(H<sub>2</sub>O)<sub>10</sub>ยท4H<sub>2</sub>O