VS
Name
—
(Ca,K,Ba)(V⁵⁺,V⁴⁺)₈O₂₀·3H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Monoclinic
Crystal system
—
—
Mohs hardness
—
3.09–3.29
Specific gravity
—
Greenish black
Streak
—
Greasy
Luster
—
{100}, perfect
Cleavage
—
C2/m
Space group
—
Straczekite
Structural group
—
Szk · Approved
IMA
—
1983
Named in
—
Greenish black; yellowish green in transmitted light
Typical colors
—
Ca · K · Ba · V · O · H
Elements
—