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Mineralpedia Details for Namansilite

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Namansilite

Namansilite

Named for the composition of sodium, also called natrium (na), manganese (man), and silicon (sil). Namansilite is a rare mineral that occurs in Russia, Italy, Australia, as well as in newer localities in Germany, Japan, and Romania. It can be found in manganese and sodium-rich sediments that have been metamorphosed and oxidized.

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

Formula
NaMn3+Si2O6 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
brownish red, violet red 
Streak
brown red 
Class
Monoclinic - Prismatic 
Hardness
6-7 
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Namansilite from Cerchiara mine, Borghetto di Vara, La Spezia, Liguria, Italy

Namansilite
            from Cerchiara mine, Borghetto di Vara, La Spezia, Liguria, Italy

Namansilite is a Na Clinopyroxene which occurs in highly metamorphosed and oxidized sedments rich in Manganese and Sodium forming irregular pods. This particular specimen is good, rich example of deep hematitic red tightly compact fibrous crystals.

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