Betpakdalite-NaCa
Chemical formula: [Na<sub>2</sub>(H<sub>2</sub>O)<sub>17</sub>Ca(H<sub>2</sub>O)<sub>6</sub>][Mo<sup>6+</sup><sub>8</sub>As<sup>5+</sup><sub>2</sub>Fe<sup>3+</sup><sub>3</sub>O<sub>34</sub>(OH)<sub>3</sub>]
Cabinet No. 40
Chemical formula: [Na<sub>2</sub>(H<sub>2</sub>O)<sub>17</sub>Ca(H<sub>2</sub>O)<sub>6</sub>][Mo<sup>6+</sup><sub>8</sub>As<sup>5+</sup><sub>2</sub>Fe<sup>3+</sup><sub>3</sub>O<sub>34</sub>(OH)<sub>3</sub>]