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Named for the abundance of manganese and as a chemical variant of the neptunite structure. Manganoneptunite is a rare mineral that occurs in only a few countries worldwide including in Russia, the United States, Canada, Malawi, Morocco and Namibia. It is found as a late-forming segregation mineral in nearly all rock types at its Russian localities in the Lovozero massif in Russia.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/manganneptunite.pdf

Named for being the Mn²⁺ analogue of the mineral nordite-Ce. Found only at the co-type localities at the Kedykverpakhk Mountain and the Karnasurt Mountain, both in the Lovozero massif of the Kola Peninsula of Russia. Occurs as colorless to pale brown, thin, platy crystals in rosettes or spherulites in sodalite syenites and ussingite veins.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)