VS
Name
—
Mn²⁺₇(AsO₄)₂(OH)₈
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Monoclinic
Crystal system
—
4.5
Mohs hardness
—
3.83
Specific gravity
—
Gray to faint brown
Streak
—
Vitreous, slightly greasy on fracture surfaces
Luster
—
Distinct, {001}
Cleavage
—
P2_1/a
Space group
—
Allactite
Structural group
—
Ala · Approved
IMA
—
1884
Named in
—
Brown, dark to light purplish red, brownish red, colorless to white
Typical colors
—
Mn · As · O · H
Elements
—