Specimen Royal Ontario Museum Neptunite is another rare species from Mont Saint-Hilaire. Color is usually dark red to black. Luster is vitreous. Diaphaneity is translucent to opaque. Crystal Habits include embedded blebs in mangan-neptunite crystals.
Fracture is conchoidal.
Hardness is 5 - 6. Streak is reddish-brown. Associated Minerals include mangan-neptunite.