Manaksite

manaksite

lomonosovite

ussingite

zakharovite

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Formula: KNaMn2+Si4O10
Inosilicate (chain silicate), litidionite group, manganese-bearing mineral
Specific gravity: 2.73
Hardness: 5
Streak: White
Colour: Colourless, pinkish yellow to greyish pink
Solubility: Readily soluble in cold 10% hydrochloric acid
Common impurities: Sr,Ca,Mg,Fe
Environments

Pegmatites

Localities

At the type locality, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia, manaksite occurs in an ultra-agpaitic pegmatite. Associated minerals include K-feldspar, nepheline, sodalite, cancrinite, analcime, albite, cancrisilite, arfvedsonite, aegirine, ussingite, makatite, grumantite, lomonosovite and villiaumite (Dana, HOM).

At the Palitra pegmatite (Palette pegmatite), Karnasurt mine, Kedykverpakhk Mountain, Lovozersky District, Murmansk Oblast, Russia, manaksite occurs as crystals to 20 cm and crystal clusters to several kg, closely associated with natrosilite, villiaumite, ussingite, analcime, vuonnemite, chkalovite, bario-olgite, steenstrupine-(Ce) and sphalerite. Manaksite is unstable and some crystals are partially or completely replaced by serandite and aegirine. Films and crusts of yellow zakharovite commonly replace manaksite in cracks in the crystal surfaces (Minrec 36.5.406-407).

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