VS
Name
—
Ca₀.₅(V⁴⁺,V⁵⁺)(W⁶⁺,Fe³⁺)₂O₈(OH)·2H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Monoclinic
Crystal system
—
2.5
Mohs hardness
—
4.03
Specific gravity
—
Brown
Streak
—
Subadamantine to resinous, may be dull
Luster
—
One direction, good, parallel to the plane of flattening
Cleavage
—
Pmmn
Space group
—
—
Structural group
—
Rka · Approved
IMA
—
1983
Named in
—
Dark brown to brownish yellow
Typical colors
—
Ca · V · W · Fe · O · H
Elements
—