Natrophilite is a mineral with the chemical formula NaMnPO4. In a pure form it has a yellow coloration. Its crystals are orthorhombic to dipyramidal. It is transparent to translucent. It is not radioactive. Natrophilite is rated 4.5 to 5 on the Mohs Scale. At Branchville, Fairfield County, Connecticut, it is found as a rare replacement of lithiophilite within a complex granite pegmatite, together with triploidite, eosphorite and dickinsonite.
References
Webmineral entry