VS
Name
—
NaFe²⁺₂(Fe²⁺₃Al₂)(Si₅Al₃)O₂₂(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
6
Mohs hardness
—
3.488
Specific gravity
—
Colorless to very pale brown
Streak
—
[Vitreous.]
Luster
—
Perfect on {210} intersecting at ~56°
Cleavage
—
Pnma
Space group
—
Amphibole
Structural group
—
Fpa · Approved
IMA
—
2020
Named in
—
Pale brown
Typical colors
—
Na · Fe · Al · Si · O · H
Elements
—