VS
Name
—
KFe²⁺₂NbO₂(PO₄)₂·2H₂O
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Orthorhombic
Crystal system
—
4
Mohs hardness
—
3.31–3.36
Specific gravity
—
Olive-green
Streak
—
Subadamantine, may be bronzy
Luster
—
—
Cleavage
—
Pb2_1m
Space group
—
—
Structural group
—
Osd · Approved
IMA
—
1974
Named in
—
Deep brown, red-brown to black
Typical colors
—
K · Fe · Nb · O · P · H
Elements
—