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Formula: Na5Ca4(PO4)4F
Anhydrous phosphate containing halogen
Crystal System: Triclinic
Specific gravity: 3.01 measured, 3.05 calculated
Hardness: 4½
Streak: White
Colour: Colourless
Solubility: Insoluble in water, but dissolves readily with no residue at room temperature in 10% HCl.
Environments
Localities
There are two co-type localities, the Kuniok Valley and the Material'naya Adit, Yukspor Mt, both in the Khibiny
Massif, Murmansk Oblast, Russia. Nefedovite occurs here as irregular grains from 0.01 to 0.5 mm, in
aggregates up to 5 mm, and as a fine-grained replacement of apatite.
Associated minerals include apatite,
nacaphite, eudialyte,
delhayelite, canasite,
djerfisherite, rasvumite,
orthoclase, adularia,
nepheline, alkali amphibole
and titanite. The environment is
pegmatitic segregations in
agpaitic
nepheline syenites
(AM 69.812-813, HOM).
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