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Formula: Na2Ti2O3(Si2O6)
Inosilicate (chain silicate), titanium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3.42 to 3.45 measured, 3.44 calculated
Hardness: 6
Streak: White to pale brown
Colour: Pale purple-brown, pale pink to mauve, brown to black
Common impurities: Zr,Al,Y,TR,La,Ce,Fe,Nb,Mn,Ca,Sr,F,H2O
Environments
Igneous environments
Pegmatites
Lorenzenite occurs in nepheline syenites and their
associated pegmatites, associated with
aegirine, nepheline,
microcline, arfvedsonite,
elpidite, loparite,
eudialyte, astrophyllite,
manganoneptunite,
låvenite,
rinkite, apatite,
titanite and ilmenite
(HOM).
The type locality is the Narssârssuk pegmatite, Narsaarsuk Plateau, Igaliku, Kujalleq, Greenland, Denmark.
At the Flora mountain (Selsurt mountain), Lovozero masssif, Murmansk Oblast, Russia, lorenzenite has been
found in
albite
(FM 46606).
At the Lujavr-Urt (Lovozero) alkali massif, Russia, a specimen of coarse-grained
nepheline syenites has, in addition to
aegirine and microcline,
eudialyte and ramsayite (lorenzenite) as its major components.
The most common accessory mineral is aegirine (acmite)
(AM 72.173-177)
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