VS
Name
—
Al₀.₆(V⁵⁺,V⁴⁺)₈O₂₀·9H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Monoclinic
Crystal system
—
—
Mohs hardness
—
2.7
Specific gravity
—
—
Streak
—
—
Luster
—
{001}, perfect
Cleavage
—
C2/c
Space group
—
Straczekite
Structural group
—
Brd · Approved
IMA
—
1970
Named in
—
Black to dark green; in reflected light shows green internal reflections
Typical colors
—
Al · V · O · H
Elements
—