VS
Name
—
Ca₄Be₂₊ₓAl₂₋ₓSi₉O₂₆₋ₓ(OH)₂₊ₓ (x = 0 to 1)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
5.5
Mohs hardness
—
2.71–2.74
Specific gravity
—
white
Streak
—
Vitreous
Luster
—
Perfect on {001}, fair on {100}
Cleavage
—
Cmcm
Space group
—
—
Structural group
—
Bvn · Approved
IMA
—
1901
Named in
—
White, Colorless, Green, Pink
Typical colors
—
Ca · Be · Al · Si · O · H
Elements
—