VS
Name
—
CoFe³⁺₂(AsO₄)₂(OH)₂·4H₂O
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Monoclinic
Crystal system
—
3.5–4
Mohs hardness
—
3.22
Specific gravity
—
White to light brown
Streak
—
Vitreous (crystals); silky (tufts)
Luster
—
None observed
Cleavage
—
P2_1/c
Space group
—
Arthurite
Structural group
—
Caru · Approved
IMA
—
2001
Named in
—
Straw-yellow (exterior) to dark brown (core)
Typical colors
—
Co · Fe · As · O · H
Elements
—