VS
Name
—
(Ca,Na,K)₀.₉(V⁵⁺,V⁴⁺,Fe²⁺,Ti)₈O₂₀·4H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Monoclinic
Crystal system
—
—
Mohs hardness
—
2.78
Specific gravity
—
—
Streak
—
Submetallic
Luster
—
—
Cleavage
—
C2/m
Space group
—
Straczekite
Structural group
—
Frn · Approved
IMA
—
1915
Named in
—
Dull green; light green, dark olive-green, brownish green in transmitted light
Typical colors
—
Ca · Na · K · V · Fe · Ti · O · H
Elements
—