VS
Name
—
Pb(Mn,Y,U)(Fe,Zn)₂(Ti,Fe,Cr,V)₁₈(O,OH)₃₈
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Hexagonal
Crystal system
—
6
Mohs hardness
—
5.2–5.3
Specific gravity
—
Brownish black
Streak
—
Submetallic
Luster
—
—
Cleavage
—
R-3
Space group
—
Crichtonite
Structural group
—
Sna · Grandfathered
IMA
—
1898
Named in
—
Black; oil-green to greenish black in transmitted light
Typical colors
—
Pb · Mn · Y · U · Fe · Zn · Ti · Cr · V · O · H
Elements
—