VS
Name
—
NaFe²⁺Al₅(PO₄)₄(OH)₆·2H₂O
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Monoclinic
Crystal system
—
5
Mohs hardness
—
3.05
Specific gravity
—
Pale blue
Streak
—
—
Luster
—
On {100}, perfect
Cleavage
—
C2/c
Space group
—
Dufrénite
Structural group
—
Brg · Approved
IMA
—
1976
Named in
—
Bluish to blue-green; commonly shows a zoned hourglass structure, centrally blue with colorless margins
Typical colors
—
Na · Fe · Al · P · O · H
Elements
—