VS
Name
—
Sr(Mn,Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH)₃₈
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Trigonal
Crystal system
—
4.5–5
Mohs hardness
—
4.46
Specific gravity
—
—
Streak
—
Metallic, dull to bright
Luster
—
—
Cleavage
—
R-3
Space group
—
Crichtonite
Structural group
—
Cic · Approved
IMA
—
1814
Named in
—
Black
Typical colors
—
Sr · Mn · Y · U · Fe · Ti · Cr · V · O · H
Elements
—