VS
Name
—
BeY(SiO₄)(OH)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5–5.5
Mohs hardness
—
4.42–4.57
Specific gravity
—
—
Streak
—
Vitreous. Optical Class. Biaxial (+)
Luster
—
None detected
Cleavage
—
P2_1/a
Space group
—
Gadolinite
Structural group
—
Hin-Y · Approved
IMA
—
1981
Named in
—
Milky white, light yellow, light green, light blue; colorless in transmitted light
Typical colors
—
Be · Y · Si · O · H
Elements
—