Sorosilicate (Si2O7 groups), murmanite group, titanium-bearing mineral
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
Plutonic igneous environments
Murmanite occurs in pegmatites and associated alkalic
syenites as a
primary magmatic mineral or
as a supergene alteration product of
lomonosovite. Associated minerals include
lamprophyllite, rinkite and
ussingite. Alteration products include
labuntsovite and belyankinite
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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