VS
Name
—
Ca₄Al₂(OH)₁₂(Cl,CO₃,OH)₂·4H₂O
Formula
—
Mineral Species
Entry type
—
Carbonates
Chemical class
—
Monoclinic
Crystal system
—
3
Mohs hardness
—
2.09–2.15
Specific gravity
—
—
Streak
—
Vitreous, pearly on cleavages
Luster
—
{001}, perfect; another inclined at ∼60° to {100}, poor
Cleavage
—
P2/c
Space group
—
Hydrotalcite
Structural group
—
Hcl · Grandfathered
IMA
—
1934
Named in
—
Colorless to light green; colorless in thin section
Typical colors
—
Ca · Al · O · H · Cl · C
Elements
—