VS
Name
—
Be₄Si₂O₇(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
6–7
Mohs hardness
—
2.59–2.6
Specific gravity
—
white
Streak
—
Vitreous, pearly on {001}
Luster
—
Perfect on {001}; distinct on {100}, {010}, and {110}
Cleavage
—
Cmc2_1
Space group
—
—
Structural group
—
Btd · Grandfathered
IMA
—
1878
Named in
—
Colorless, White, Yellow
Typical colors
—
Be · Si · O · H
Elements
—