VS
Name
—
YFe³⁺Nb₂O₈
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Monoclinic
Crystal system
—
5–6
Mohs hardness
—
5–5.69
Specific gravity
—
Dark reddish brown to black, yellow-brown; gray when altered
Streak
—
Vitreous to resinous, may be submetallic, splendent; externally dull
Luster
—
{010}, indistinct
Cleavage
—
P2/c
Space group
—
Samarskite
Structural group
—
Smk-Y · Approved
IMA
—
1847
Named in
—
Velvet-black, may have a brownish tint, brown to yellowish brown due to alteration
Typical colors
—
Y · Fe · Nb · O
Elements
—