Manganonordite-(Ce)

manganonordite-(Ce)

eudialyte

sodalite

vuonnemite

Images

Formula: Na₃SrCeMn²⁺Si₆O₁₇
Inosilicate (chain silicate) with multiple chains, nordite group, strontium-, cerium- and manganese- bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3.43, measured, 3.51 calculated
Hardness: 5 to 5½
Streak: White
Colour: Greyish pink when fresh, black to brown or yellow when altered
Environments

Pegmatites

Localities

There are two co-type localities, Pegmatite No. 60, Second Eastern Stream, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia and Kedykverpakhk Mountain, Lovozersky District, Murmansk Oblast, Russia'

At the type localities manganonordite-(Ce) forms thin platy crystals up to 10 × 10 × 2 mm³, grouped in 2 to 2.5 cm rosettes or spherulites. When fresh, the mineral is transparent, colourless or pale brown, whereas altered grains are brown. It has a white streak and vitreous lustre.
Manganonordite-(Ce) occurs in sodalite syenites and in ussingite veins, associated with aegirine, eudialyte, sodalite, vuonnemite and other minerals typical of alkaline rocks (AM 84.4.685).
Manganonordite-(Ce) from Pegmatite No 60 - Image

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