Inosilicate (chain silicate), pyroxene group
Specific gravity: 3.6
Hardness: 6 to 7
Colour: Dark brownish red, purplish red
Common impurities: Al,Ti,Fe,Mg,Ca,K,Sr,Ba
Namansilite occurs in low-grade metamorphosed and highly oxidised
manganese and sodium rich sediments
At Woods Mine, Darling county, New South Wales, Australia, namansilite is associated with quartz, serandite, aegirine and mangano-ferri-eckermannite (HOM).
At the Cerchiara Mine, Borghetto di Vara, La Spezia Province, Liguria, Italy, namansilite is associated with pectolite, K-feldspar, braunite and quartz (HOM).
There are two co-type localities, the Dzhavodi area and the Zaoblachnyi area, both in the Ir-Nimi manganese deposit, Taikan Ridge, Khabarovsk Krai, Russia. In this deposit namansilite occurs in veins up to 3 mm wide in braunite ore. Associated minerals include braunite, taikanite, pectolite, manganoan amphiboles, manganoan orthoclase and manganoan phlogopite (AM 78.1316).
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