Ferroeckermannite
Na₃(Fe,Mg)₄AlSi₈O₂₂(OH)₂

     Ferroeckermannite, a member of the amphiboles group, was recently identified at mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually greenish blue.
Luster is vitreous to silky.
Diaphaneity is translucent to opaque.
Crystal System is monoclinic, C2/m.
Crystal Habits include platy and prismatic crystals, spherical aggregates.
Cleavage {110} is perfect with parting on {010}.
Fracture is uneven.
Hardness is 5 - 6.
Specific Gravity is approximately 3,25 g/cm³.
Streak is light ot dark blueish grey.
Associated Minerals include (??).
Distinguishing Features: (??).
Origin: Named in 1964 for its ferrous content and its relationship
     with eckermannite.

CLASSIFICATION:

REFERENCES:
Dana 8:1364-1365 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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