VS
Name
—
CaAl₂(CO₃)₂(OH)₄·4H₂O
Formula
—
Mineral Species
Entry type
—
Carbonates
Chemical class
—
Triclinic
Crystal system
—
2.5
Mohs hardness
—
2.21–2.24
Specific gravity
—
—
Streak
—
Vitreous to pearly, earthy
Luster
—
{100} perfect; {010} imperfect
Cleavage
—
P-1
Space group
—
Alumohydrocalcite
Structural group
—
Ahcal · Approved
IMA
—
1926
Named in
—
Chalky white to pale blue, pale yellow, cream, gray
Typical colors
—
Ca · Al · C · O · H
Elements
—