VS
Name
—
K₄Na₁₂Fe³⁺₂Si₁₆O₄₁(OH)₄·2H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
3
Mohs hardness
—
2.42
Specific gravity
—
[White.]
Streak
—
Vitreous or silky
Luster
—
On {100} and {010}, perfect
Cleavage
—
Cmcm
Space group
—
—
Structural group
—
Tie · Approved
IMA
—
1991
Named in
—
Grayish white; colorless in thin section
Typical colors
—
K · Na · Fe · Si · O · H
Elements
—