Neighborite
NaMgF₃

     Neighborite is very rare at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually dark red, reddish brown.
Luster is vitreous; dull to greasy.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic; Pnma.
Crystal Habits include pseudo-octahedral and pseudocuboctahedral
    crystals to 2mm, pseudocubic crystals to 3mm.
Cleavage is not apparent.
Fracture is uneven.
Hardness is 4.5
Specific Gravity is approximately 3.0 g/cm³.
Streak is white.
Associated Minerals include aegirine, brookite, calcite, catapleiite,
   dolomite, epididymite, fluorite, mckelveyite, microcline, pyrophanite,
   rutile and siderite.
Distinguishing Features: Crystal habit.
Origin: Named in 1961 after Frank Neighbor (b. 1906), American
   petroleum geologist.

CLASSIFICATION:

REFERENCES:
MinRec 21:325-326 (1990), Dana 8:407 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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