Formula: Be₃Al₂Si₆O₁₈

Species: Silicates – (Cyclosilicates)

Colour: Colorless, green, blue, yellow, white, pink, etc.

Lustre: Vitreous, Sub-Vitreous, Waxy, Greasy

Hardness: 7½ – 8

Specific Gravity: 2.63 – 2.92

Crystal System: Hexagonal

Member of: Beryl Group, A sky-blue to sea-green gem variety of beryl. It is mainly associated with granitic pegmatites.

Name: Possibly from the Greek “beryllos” which referred to a number of blue-green stones in antiquity.