Lorenzenite

lorenzenite

nepheline

aegirine

aefvedsonite

Images

Formula: Na2Ti2O3(Si2O6)
Inosilicate (chain silicate)
Specific gravity: 3.42 to 3.45
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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