Vuonnemite
Na₅Nb₂Ti³⁺(Si₂O₇)₂O₂F₂ · 2Na₃PO₄

     Vuonnemite is rare at Mont Saint-Hilaire. It fluoresces intense greenish-yellow under SW, and pale yellow under LW and retains a faint bluish-green phosphorescence.

PHYSICAL CHARACTERISTICS:

Color is usually pale yellow to lemon-yellow.
Luster is vitreous to greasy.
Diaphaneity is transparent to translucent.
Crystal System is triclinic; P1.
Crystal Habits include tabular crystals to 2cm, embedded cleavages
   and free-standing crystals to 6cm.
Cleavage {001} and two others are perfect.
Fracture is (??).
Hardness is 2 - 3.
Specific Gravity is approximately 3.1 g/cm³.
Streak is white.
Associated Minerals include analcime, eudialyte and microcline.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1973 after its discovery locality, near the Vuonnemiok
   River, Khibina alkaline complex, Russia.

CLASSIFICATION:

REFERENCES:
MinRec 21:346 (1990), Dana 8:1187 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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