Kellyite
(Mn,Mg,Al)₃(Si,Al)₂O₅(OH)₄

     Kellyite occurs rarely at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually colorless.
Luster is vitreous.
Diaphaneity is transparent.
Crystal System is hexagonal; P6₃.
Crystal Habits include thin laths.
Cleavage {001} is perfect.
Fracture is not apparent due to cleavage.
Hardness is 2.5
Specific Gravity is approximately 3.1 g/cm³.
Streak is white.
Associated Minerals include aegirine, analcime, calcite, catapleiite,
   microcline and natrolite.
Distinguishing Features: Crystal habit.
Origin: Named in 1974 after William Crowley Kelly (b.1929), American
   geology professor.

CLASSIFICATION:

REFERENCES:
Dana 8:1426 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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