Ferronyböite
Na₃Fe²⁺₃Al₂(Si₇AlO₂₂)(OH)₂

     Ferronyböite, a member of the amphiboles, has been recently at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually blueish.
Luster is vitreous.
Diaphaneity is translucent.
Crystal System is monoclinic, C2/m.
Crystal Habits include (??).
Cleavage {110} is perfect.
Fracture is (??).
Hardness is ~ 5 - 6.
Specific Gravity is approximately ~ 3,11 g/cm³.
Streak is (??).
Associated Minerals include (??).
Distinguishing Features: brittle, pleochroism.
Origin: Named in 1997 for its ferrous content and its relationship to nyböite.

CLASSIFICATION:

REFERENCES:
pending

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

Legend