VS
Name
—
K₁.₅₋ₓ(Ca,Y,REE)₅[Si₆O₁₅][Si₂O₇](OH,F)₂·yH₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
5.5–6
Mohs hardness
—
2.84–2.93
Specific gravity
—
White
Streak
—
Vitreous
Luster
—
Perfect on {100}, imperfect on {010}
Cleavage
—
P-1
Space group
—
—
Structural group
—
Mis · Grandfathered
IMA
—
1950
Named in
—
Red-brown, raspberry-red, pink, with a lavender hue where weathered
Typical colors
—
K · Ca · Y · REE · Si · O · H · F
Elements
—