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Mineralpedia Details for Manganoneptunite

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Manganoneptunite

Manganoneptunite

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

Formula
KNa2LiMn2+2Ti2Si8O24 
Crystal System
Monoclinic 
Luster
Vitreous (Glassy) 
Color
red 
Class
Monoclinic - Prismatic 
Hardness
5-6 
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Manganoneptunite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Manganoneptunite
            from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Deep red, root beer red, much like red sphalerite with a vireous luster, well-formed monoclinic prisms to 4mm.

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