VS
Name
—
Pb₂₁Cu₂₀Cl₄₂(OH)₄₀·6H₂O
Formula
—
Mineral Species
Entry type
—
Halides
Chemical class
—
Tetragonal
Crystal system
—
2.5
Mohs hardness
—
4.656
Specific gravity
—
Sky-blue
Streak
—
Weakly vitreous to adamantine
Luster
—
{101}, good; {110}, distinct; {001}, poor
Cleavage
—
I4/mmm
Space group
—
—
Structural group
—
Cge · Approved
IMA
—
1893
Named in
—
Indigo blue
Typical colors
—
Pb · Cu · Cl · O · H
Elements
—