Charleshatchettite is a very rare, complex, niobium oxide mineral with the formula CaNb<sub>4</sub>O<sub>10</sub>(OH)<sub>2</sub>â¢8H<sub>2</sub>O. It was discovered in the mineral-rich site Mont Saint-Hilaire, Montérégie, Québec, Canada.
Charleshatchettite is chemically similar to hochelagaite.