VS
Name
—
Na MnMn₂(AsO₄)[AsO₃(OH)]₂
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Monoclinic
Crystal system
—
2.5
Mohs hardness
—
4.112
Specific gravity
—
Pale tan
Streak
—
Vitreous
Luster
—
Perfect on {010} and {101}
Cleavage
—
C2/c
Space group
—
Alluaudite
Structural group
—
Can · Approved
IMA
—
2013
Named in
—
Reddish brown; light reddish brown in transmitted light
Typical colors
—
Na · Mn · As · O · H
Elements
—