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Formula: Na2Ti2Na2Ti2(Si2O7)2O4(H2O)4
Sorosilicate (Si2O7 groups), murmanite group,
titanium-bearing mineral
Crystal System:
Specific gravity: 2.76 to 2.84
Hardness: 2½ to 3
Streak: Pink to red or brown
Colour: Lilac to pink, alters to silvery white-yellow, brown to black
Solubility: Decomposed by hydrochloric and sulphuric acids, leaving a silica residue
Common impurities: Zr,Fe,Ta,Mn,Mg,Ca,K,P
Environments
Plutonic igneous environments
Pegmatites
Murmanite occurs in pegmatites and associated alkalic
syenites as a
primary magmatic mineral or
as a supergene alteration product of
lomonosovite. Associated minerals include
lomonosovite, aegirine,
arfvedsonite, neptunite,
microcline, albite,
natrolite, analcime,
nepheline, sodalite,
eudialyte, lorenzenite,
lamprophyllite, rinkite and
ussingite. Alteration products include
labuntsovite and belyankinite
(HOM, Dana).
Localities
There are two co-type localities, the Chinglusuai River Valley and the Raslak Cirques, both in the Lovozersky District,
Murmansk Oblast, Russia, in an alkaline complex
(Mindat).
At the Maly Mannepakhk Mt, Khibiny Massif, Murmansk Oblast, Russia, murmanite occurs in a
pegmatite in
nepheline syenite associated with
gutkovaite-Mn. Other minerals associated with
gutkovaite-Mn here include
microcline, aegirine,
arfvedsonite, nepheline,
eudialyte, albite,
lorenzenite, loparite,
aenigmatite,
manganoneptunite, analcime,
natrolite, stilbite,
chabazite, kuzmenkoite-Mn
and nontronite
(Minrec 35.4.352).
At the Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, murmanite occurs in peralkaline
pegmatites, associated with
ikranite. Other minerals associated with
ikranite include aegirine,
microcline, lorenzenite,
nepheline, lamprophyllite
and arfvedsonite
(Minrec 35.4.353).
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