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Formula: KNaMn2+Si4O10
Inosilicate (chain silicate), litidionite group,
manganese-bearing mineral
Crystal System: Triclinic
Specific gravity: 2.73 measured, 2.71 calculated
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
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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