Natrolemoynite (Type Locality)
Na₄Zr₂Si₁₀O₂₆ · 9H₂O

     Natrolemoynite was recently published in The Canadian Mineralogist, Vol 39 #5, October (2001). The occurrence is rare and seems to be confined to pegmatites.

PHYSICAL CHARACTERISTICS:

Color is usually colorless to white (occasionally with a slightly pink
   to red tinge).
Luster is vitreous to subadamantine.
Diaphaneity is transparent to translucent.
Crystal System is monoclinic; C2/m.
Crystal Habits include bladed to prismatic crystals, elongated
   along [001], 1 mm wide x 2 mm in length, forming compact
   radial aggregates spheres to 4 mm in diameter.
Cleavage {010} and {100} are perfect, {001} is poor.
Fracture is uneven.
Hardness is approximately 3.
Specific Gravity is approximately 2.47 g/cm³.
Streak is white.
Associated Minerals include calcite, galena, lemoynite, lepidocrocite,
   microcline, pyrite and sphalerite (in altered pegmatites), and albite,
   biotites, burbankites, chlorites, magnetite, microcline, pyrochlore,
   zircon and an unidentified donnayite-(Y)-like mineral
   (in unaltered pegmatites).
Distinguishing Features: Crystal habit and cleavage.
Origin: Named in 2001 for its sodium content and its relationship
   to lemoynite.

CLASSIFICATION:

REFERENCES:
CanMin 39:1295-1306 (2001)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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