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Formula: (SrNa)Ti2Na3Ti(Si2O7)2O2(OH)2
Sorosilicate (Si2O7 groups),
lamprophyllite group,
seidozerite supergroup
Crystal System: Monoclinic
Specific gravity: 3.44 to 3.53 measured, 3.49 calculated
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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