VS
Name
—
BiCo₂(AsO₄)₂(OH)·H₂O
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Monoclinic
Crystal system
—
4–4.5
Mohs hardness
—
5.28
Specific gravity
—
Pale brown to nearly white
Streak
—
Adamantine
Luster
—
None
Cleavage
—
C2/m
Space group
—
Natrochalcite
Structural group
—
Snb · Approved
IMA
—
1999
Named in
—
Brown to beige (varies with Fe content)
Typical colors
—
Bi · Co · As · O · H
Elements
—