Kogarkoite
Na₃(SO₄)F

     Kogarkoite is another rare species from MSH. It exhibits a strong pale blue fluorescence under SW, and a dull white on LW.

PHYSICAL CHARACTERISTICS:

Color is usually pale blue.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is monoclinic; (?).
Crystal Habits include embedded grains and crude crystals.
Cleavage not apparent.
Fracture is conchoidal.
Hardness is 3.5
Specific Gravity is approximately 2.7 g/cm³.
Streak is white.
Associated Minerals include eudialyte, fluorite, rasvumite, revdite,
   sodalite, ussingite, villiaumite and vuonnemite.
Distinguishing Features: Color and fluorescence.
Origin: Named in 1973 after Liia Nikolaevna Kogarko (b.1936),
   Russian geologist who first observed the mineral.

CLASSIFICATION:

REFERENCES:
MinRec 21:315 (1990); Dana 8:624 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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