VS
Name
—
K₂NaFe²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
3
Mohs hardness
—
3.2–3.4
Specific gravity
—
Golden
Streak
—
Submetallic, pearly, greasy
Luster
—
Perfect on {001}, poor on {100}
Cleavage
—
P-1
Space group
—
Astrophyllite-Astrophyllite
Structural group
—
Ast · Grandfathered
IMA
—
1848
Named in
—
Bronze-yellow to gold-yellow, brown to reddish brown
Typical colors
—
K · Na · Fe · Ti · Si · O · H · F
Elements
—