Lamprophyllite

minerals

lorenzenite

lomonosovite

murmanite

Formula: (SrNa)Ti2Na3Ti(Si2O7)2O2(OH)2
Sorosilicate (Si2O7 groups), lamprophyllite group
Specific gravity:
Hardness: 2½
Streak: Brownish white
Colour: Yellow
Common impurities: Al,Fe,Nb,Ta,Mn,Mg,Ca,K,H2O
Environments

Plutonic igneous environments
Pegmatites

Localities

The type locality is the Kola Peninsula, Murmansk Oblast, Russia. Here lamprophyllite occurs in all rock types and most pegmatites of the Lovozero massif associated with microcline, nepheline, aegirine, lorenzenite, eudialyte, lomonosovite, murmanite and villiaumite (HOM).
At the Palitra pegmatite, also in the Lovozero masssif, lamprophyllite is found as radiating stars up to 3 cm most commonly situated among fibrous aegirine in the eudialyte - aegirine - microcline zone (Minrec 36.5.406).

At Pilansberg, South Africa, lamprophyllite has been found associated with microcline, nepheline, catapleiite, aegirine, calcite, fluorite, analcime and pectolite (HOM).

At Bearpaw Mountains, Hill county, MT, USA, lamprophyllite occurs in nepheline syenite (Dana).

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