Charleshatchettite is a very rare, complex, niobium oxide mineral with the formula CaNb4O10(OH)2•8H2O.Haring, M.M., and McDonald, A.M., 2015. Charleshatchettite, IMA 2015-048. CNMNC Newsletter No. 27, October 2015, 1228; Mineralogical Magazine 79, 1229–1236 It was discovered in the mineral-rich site Mont Saint-Hilaire, Montérégie, Québec, Canada.
Relation to other minerals Charleshatchettite is chemically similar to hochelagaite.
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