VS
Name
—
(Cu₂₋ₓAlₓ)H₂₋ₓSi₂O₅(OH)₄·nH₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Amorphous
Crystal system
—
2–4
Mohs hardness
—
1.93–2.4
Specific gravity
—
White when pure
Streak
—
Vitreous, porcelaneous, earthy
Luster
—
—
Cleavage
—
—
Space group
—
Allophane
Structural group
—
Ccl · Approved
IMA
—
0
Named in
—
Blue, blue-green, or green; brown to black when impure
Typical colors
—
Cu · Al · H · Si · O
Elements
—