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Dominant species
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Neptunite
Chemical
Formula
KNa2Li(Fe2+,Mn2+)2Ti2Si8O24
Species
Silicates
Crystal
System
Monoclinic
Mohs
Scale
5-6
Specific
Gravity
3.19-3.23
Color
Black; deep red-brown in thin fragments
Streak
Brown to red brown
Luster
Vitreous
Refractive
Index
n = 1.690 - 1.691 n = 1.693 - 1.700 n = 1.719 - 1.736
Diaphaneity
Opaque
Cleavage
Perfecton
Fracture
Conchoidal
Crystal Habit:Prismatic or tabular
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