VS
Name
—
Mn²⁺₉(AsO₄)₂(AsO₃)(OH)₉·2H₂O
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Orthorhombic
Crystal system
—
4.5
Mohs hardness
—
3.57–3.79
Specific gravity
—
—
Streak
—
Vitreous, adamantine to submetallic
Luster
—
On {010}, imperfect
Cleavage
—
Pnma
Space group
—
—
Structural group
—
Syd · Grandfathered
IMA
—
1884
Named in
—
Colorless internally, externally garnet-red, red-brown, dark brown, nearly black; in transmitted light
Typical colors
—
Mn · As · O · H
Elements
—