VS
Name
—
Ca(V⁵⁺,V⁴⁺)₄O₁₀·5H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Triclinic
Crystal system
—
2.5
Mohs hardness
—
2.55
Specific gravity
—
Dark reddish brown
Streak
—
Submetallic
Luster
—
Perfect on {010}
Cleavage
—
P-1
Space group
—
—
Structural group
—
Mvd · Grandfathered
IMA
—
1921
Named in
—
Black; dark reddish brown in transmitted light
Typical colors
—
Ca · V · O · H
Elements
—