VS
Name
—
Na₂(Fe³⁺,Mn²⁺)₃Si₈O₂₀(OH)₂·4H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
—
Mohs hardness
—
2.28
Specific gravity
—
—
Streak
—
Vitreous to nearly metallic, dull in aggregate
Luster
—
Good on {100}
Cleavage
—
C2/m
Space group
—
Palygorskite
Structural group
—
Tup · Approved
IMA
—
1984
Named in
—
Dark to light red-brown; in transmitted light, colorless to light yellowish brown
Typical colors
—
Na · Fe · Mn · Si · O · H
Elements
—