VS
Name
—
KNa₂LiFe²⁺₂Ti₂Si₈O₂₄
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5–6
Mohs hardness
—
3.19–3.23
Specific gravity
—
Cinnamon-brown
Streak
—
Vitreous
Luster
—
Perfect on {110}
Cleavage
—
Cc
Space group
—
Neptunite
Structural group
—
Npt · Grandfathered
IMA
—
1893
Named in
—
Black; deep red-brown in thin fragments
Typical colors
—
K · Na · Li · Fe · Ti · Si · O
Elements
—