VS
Name
—
CaMn(Fe³⁺,Mn)₂Fe³⁺₂(PO₄)₄(OH)₃·7H₂O
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Monoclinic
Crystal system
—
4.5
Mohs hardness
—
2.6
Specific gravity
—
—
Streak
—
Dull
Luster
—
Poor on {001}, and poorer on {100}
Cleavage
—
P2_1/a
Space group
—
Jahnsite
Structural group
—
Kec · Approved
IMA
—
1977
Named in
—
Dirty gray-brown to brown, yellow-brown
Typical colors
—
Ca · Mn · Fe · P · O · H
Elements
—