VS
Name
—
CaFe²⁺Mg₂Al₂(PO₄)₄(OH)₂·8H₂O
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Monoclinic
Crystal system
—
3–4
Mohs hardness
—
2.58
Specific gravity
—
—
Streak
—
—
Luster
—
On {001}, good to perfect
Cleavage
—
P2/a
Space group
—
Jahnsite
Structural group
—
Wt-CaFeMg · Approved
IMA
—
1975
Named in
—
Pale tan to gray; colorless in thin fragments
Typical colors
—
Ca · Fe · Mg · Al · P · O · H
Elements
—