VS
Name
—
Ca₄(Na,Ca)₄(Ti,Nb)₄(Si₂O₇)₂O₈F₃
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5–5.5
Mohs hardness
—
3.44–3.46
Specific gravity
—
White with pale brownish tint
Streak
—
Vitreous
Luster
—
—
Cleavage
—
C2/c
Space group
—
—
Structural group
—
Fsn · Grandfathered
IMA
—
1929
Named in
—
Dark brown to golden yellow
Typical colors
—
Ca · Na · Ti · Nb · Si · O · F
Elements
—