VS
Name
—
Ca₁.₃(V⁵⁺,V⁴⁺)₆O₁₆·6H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
—
Crystal system
—
2.5
Mohs hardness
—
2.77–2.79
Specific gravity
—
Dark brownish green
Streak
—
Vitreous, pearly to subadamantine
Luster
—
Perfect k crystal platiness
Cleavage
—
—
Space group
—
Hewettite
Structural group
—
Hdr · Approved
IMA
—
1962
Named in
—
Dark greenish black to black, turning brown on exposure to air
Typical colors
—
Ca · V · O · H
Elements
—