VS
Name
—
La(Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH,F)₃₈
Formula
—
Mineral Species
Entry type
—
Halides
Chemical class
—
Trigonal
Crystal system
—
6
Mohs hardness
—
4.33–4.48
Specific gravity
—
Grayish black to dark brown
Streak
—
Vitreous to submetallic, shining
Luster
—
—
Cleavage
—
R-3
Space group
—
Crichtonite
Structural group
—
Dvd-La · Approved
IMA
—
1906
Named in
—
Black to grayish black, brownish black, dark brown, or reddish when altered
Typical colors
—
La · Y · U · Fe · Ti · Cr · V · O · H · F
Elements
—