VS
Name
—
K₂NaMn₇(Nb,Ti)₂(Si₄O₁₂)₂O₂(OH)₄(O,F)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
3–4
Mohs hardness
—
3.325
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
Perfect on {001}
Cleavage
—
P-1
Space group
—
Astrophyllite-Kupletskite
Structural group
—
Nbk · Approved
IMA
—
1999
Named in
—
Light beige to yellow, light yellow-brown, silvery brown
Typical colors
—
K · Na · Mn · Nb · Ti · Si · O · H · F
Elements
—