VS
Name
—
Ca₄₈Mg₁₆(BO₃)₃₂(CO₃)₁₆·2(H₂O,HCl)
Formula
—
Mineral Species
Entry type
—
Borates
Chemical class
—
Cubic
Crystal system
—
5
Mohs hardness
—
2.78–2.83
Specific gravity
—
—
Streak
—
Vitreous to slightly greasy
Luster
—
—
Cleavage
—
Fd3m
Space group
—
Harkerite
Structural group
—
Skh · Approved
IMA
—
1965
Named in
—
Gray to grayish white; colorless in transmitted light
Typical colors
—
Ca · Mg · B · O · C · H · Cl
Elements
—