VS
Name
—
BeAlSiO₄(OH)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
7.5
Mohs hardness
—
2.99–3.1
Specific gravity
—
White
Streak
—
Vitreous, somewhat pearly on cleavages
Luster
—
Perfect on {010}, imperfect on {110} and {001}
Cleavage
—
P2_1/a
Space group
—
—
Structural group
—
Ecs · Grandfathered
IMA
—
1792
Named in
—
Blue, Colorless, Green
Typical colors
—
Be · Al · Si · O · H
Elements
—