VS
Name
—
U⁴⁺₂(UO₂)₄O₆(OH)₄·9H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Orthorhombic
Crystal system
—
2–3
Mohs hardness
—
5.16
Specific gravity
—
Dull violet-brown
Streak
—
Vitreous to submetallic
Luster
—
{001}, perfect; {100}, good
Cleavage
—
P2_1cn
Space group
—
—
Structural group
—
Ian · Grandfathered
IMA
—
1926
Named in
—
Violet-black; on exposure to air, turns violet-brown, pale brown, then greenish yellow or yellow
Typical colors
—
U · O · H
Elements
—