| Summary: | The asymmetric unit of the title compound, 2C10H18N+·HPO4
2−·1.5C4H4O4, contains two adamantan-1-aminium cations, one hydrogen phosphate anion, and one and a half molecules of fumaric acid, one of which exhibits crystallographic inversion symmetry. Each HPO4
2− anion is hydrogen bonded, via all of its O atoms, to four NH3
+ groups of the adamantan-1-aminium cations, forming chains along [100]. These chains are, in turn, interconnected via a set of O—H⋯O hydrogen bonds involving the fumaric acid solvent molecules, forming layers parallel to (001). Weak C—H⋯O interactions lead to a consolidation of the three-dimensional set-up.
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