Paralomonosovite

paralomonosovite

arfvedsonite

sodalite

nepheline

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Formula: Na_5+xTi₄(Si₂O₇)₂[PO₃(OH)]_2-y[PO₂(OH)₂]_yO₂[(OH,F)_2-xO_z],
[x between 0 and 2, y between 0 and 1, z between 0 and 1]
Sorosilicate (Si₂O₇ groups), murmanite group, seidozerite supergroup, titanium-bearing mineral
Crystal system: Triclinic
Specific gravity: 2.98 measured, 2.969 calculated
Hardness: 4
Colour: Yellowish brown, rose, brown
Solubility: Na₃PO₄ is readily leached from the mineral by water
Common impurities: Mn,Fe,Ca,Nb
Environments

Pegmatites

Localities

The type locality is the Tyulbnyunuai River Valley, Lovozersky District, Murmansk Oblast, Russia. Paralomonosovite occurs in alkalic pegmatites of the Lovozero massif, in poikilitic sodalite syenite and in eudialyte lujavrites. Associated minerals include microcline, aegirine, arfvedsonite, eudialyte, sodalite and nepheline (AM 48.1413-1421).

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