VS
Name
—
Fe²⁺₂Al₄Si₅O₁₈
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
7–7.5
Mohs hardness
—
2.76–2.77
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
{100}, imperfect; parting on {001}
Cleavage
—
Cccm
Space group
—
Beryl
Structural group
—
Skn · Approved
IMA
—
1967
Named in
—
Blue to blue-violet
Typical colors
—
Fe · Al · Si · O
Elements
—