VS
Name
—
Ca₄.₅AlV⁴⁺₂V⁵⁺₁₂O₄₀·28H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Tetragonal
Crystal system
—
2
Mohs hardness
—
2.8
Specific gravity
—
Pale blue
Streak
—
Vitreous to earthy
Luster
—
—
Cleavage
—
I4_1/amd
Space group
—
—
Structural group
—
Swd · Grandfathered
IMA
—
1958
Named in
—
Dark blue-black, with progressive alteration becoming blue-green and yellow-green
Typical colors
—
Ca · Al · V · O · H
Elements
—