VS
Name
—
NaCaCaMn₂(AsO₄)₃
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Monoclinic
Crystal system
—
4
Mohs hardness
—
4.29
Specific gravity
—
—
Streak
—
Greasy
Luster
—
On {110} and {010}, distinct
Cleavage
—
I2/a
Space group
—
Alluaudite
Structural group
—
Cyn · Approved
IMA
—
1874
Named in
—
Nut-brown to yellowish brown; in transmitted light, pale yellow-brown
Typical colors
—
Na · Ca · Mn · As · O
Elements
—