Formula: NaCaBeSi2O6F
Sorosilicate (Si2O7 groups), beryllium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 2.96 to 3.07 measured, 2.961 calculated
Hardness: 3 to 4
Streak: White
Colour: Colourless, pale yellow, light green
Luminescence: Triboluminescent with orange red light; pink, rarely blue in short wave and long wave UV; strongly
phosphorescent (Mindat)
Common impurities: Al,Fe,Mg,K,H2O
Environments:
Leucophanite is a beryllium mineral associated with
pyrochlore,
nepheline, mosandrite-(Ce), albite,
aegirine (Mindat),
orthoclase,
natrolite, analcime,
serandite,
polylithionite,
ancylite, astrophyllite,
catapleiite,
epididymite,
rhodochrosite and
fluorite
(HOM).
Localities
At the type locality, Låven, Larvik Commune, Vestfold, Norway, leucophanite occurs in
pegmatites in augite
syenite
(HOM).
Leucophanite from Larvik Commune -
Image
At the Baikal Massif, Russia, leucophanite occurs in albitisation
zones in pegmatites at the contact of alkalic massifs
intruding carbonaceous
quartz-sericite
schists
(HOM).
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