VS
Name
—
Y₄Al(SiO₄)₂(OH)₂F₅
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
4–5
Mohs hardness
—
4.3
Specific gravity
—
White
Streak
—
Adamantine
Luster
—
Poor on {010}
Cleavage
—
P1
Space group
—
—
Structural group
—
Klo-Y · Approved
IMA
—
1984
Named in
—
Colorless
Typical colors
—
Y · Al · Si · O · H · F
Elements
—