VS
Name
—
Bi₂Fe³⁺(Fe³⁺,Co)₂(O,OH)₄(AsO₄)₂
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Triclinic
Crystal system
—
4.5
Mohs hardness
—
5.81
Specific gravity
—
Light brown
Streak
—
Adamantine
Luster
—
Good on {001}
Cleavage
—
P-1
Space group
—
Medenbachite
Structural group
—
Neu · Approved
IMA
—
1998
Named in
—
Brown, nearly black as crusts
Typical colors
—
Bi · Fe · Co · O · H · As
Elements
—