VS
Name
—
Mg₁₂(PO₃OH,CO₃)(PO₄)₅(OH,O)₆
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Hexagonal
Crystal system
—
4.5–5
Mohs hardness
—
2.94
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
—
Cleavage
—
P31m
Space group
—
Holtedahlite
Structural group
—
Htd · Approved
IMA
—
1976
Named in
—
Colorless, grayish from inclusions of magnetite
Typical colors
—
Mg · P · O · H · C
Elements
—