Images
Formula: Na2Ca(PO4)F
Anhydrous phosphate containing halogen
Crystal System: Monoclinic
Specific gravity: 2.85
Hardness: 3
Streak: White
Colour: Colourless
Environments
Pegmatites
Hydrothermal environments
Localities
At the Khibiny Massif, Murmansk Oblast, Russia, nacaphite is a rare late-stage hydrothermal mineral in
ijolite-urtite
pegmatite. Associated minerals include
thermonatrite, villiaumite,
aegirine, apatite and
barytolamprophyllite
(HOM).
At the type locality, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia, nacaphite is formed at a very late
stage in ijolite-urtite
pegmatite in subsurface
apatite mines. The nacaphite occurs as inclusions,
about 1 mm in size, in thermonatrite, associated with
apatite, aegirine, and
barytolamprophyllite
(AM 66.218).
It is interstial with nepheline,
potassic-arfvedsonite,
microcline and eudialyte and
associated with sodalite, kalsilite,
pectolite, lamprophyllite,
lomonosovite, ershovite,
loparite-(Ce) and
djerfisherite
(HOM).
Back to Minerals