The content of Al is 6.86 wt.% Al2O3 (average of 8 analyses; Lykova et al., 2024) in natromelansonite and 6.29 wt.% Al2O3 (average of 8 analyses; Lykova et al., 2024 [note there is a typo in Lykova et al., 2024: 5.89 instead of 6.89; so the correct range is 5.53–6.89] and 6.32 wt.% Al2O3 (average of 15 analyses; Gore and McDonald, 2023) in melansonite. These numbers are very consistent and correspond to ~1 atoms per formula unit of Al.

In the structures of both melansonite...

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