Neptunite
KNa₂Li(Fe²⁺,Mn)₂Ti₂O₂(Si₈O₂₂)

     Neptunite is another rare species from Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually dark red to black.
Luster is vitreous.
Diaphaneity is translucent to opaque.
Crystal System is monoclinic; Cc.
Crystal Habits include embedded blebs in mangan-neptunite crystals.
Cleavage {110} is perfect.
Fracture is conchoidal.
Hardness is 5 - 6.
Specific Gravity is approximately 3.2 g/cm³.
Streak is reddish-brown.
Associated Minerals include mangan-neptunite.
Distinguishing Features: Association.
Origin: Named in 1893 after Neptune, Roman god of the sea, because
   it was found with aegirine, which was named after Aegir, Scandinavian
   sea god.

CLASSIFICATION:

REFERENCES:
Dana 8:1401-1402 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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