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Formula: NaMn3+Si2O6
Inosilicate (chain silicate), clinopyroxene subgroup,
pyroxene group
Crystal System: Monoclinic
Specific gravity: 3.51 measured, 3.61 calculated
Hardness: 6 to 7
Streak: Brown-red
Colour: Dark brownish red, purplish red
Common impurities: Al,Ti,Fe,Mg,Ca,K,Sr,Ba
Environments
Sedimentary environments
Metamorphic environments
Namansilite occurs in low-grade metamorphosed and highly oxidised
manganese and sodium rich sediments
(HOM).
Localities
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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