VS
Name
—
Ca₂Fe³⁺₃(AsO₄)₃(OH)₄·4H₂O
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
—
Crystal system
—
2–3
Mohs hardness
—
2.65
Specific gravity
—
Brownish yellow
Streak
—
Vitreous to resinous
Luster
—
—
Cleavage
—
—
Space group
—
—
Structural group
—
Yuk · Grandfathered
IMA
—
1913
Named in
—
Dark brown, brownish black, violet to deep blood-red; in thin splinters, deep brown, yellowish brown
Typical colors
—
Ca · Fe · As · O · H
Elements
—