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Beryl (Photo) [abbr. Brl ]

Year of discovery: before 1565 (World), 1885 (Japan)

Locality list: 139 localities of beryl

• Be₃Al₂Si₆O₁₈
• [Be²⁺₃][Al³⁺₂][(SiO₃)₆]^12-

• Class: Cyclosilicate (Single ring)
• Variety: Aquamarine (Water blue)
• Variety: Emerald (Green)
• Insoluble in: HCl
• Fluorescence: UV excitation (Green, Some examples)

• Be => CsLi: Pezzottaite

• Al => Sc: Bazzite

• Color: Green, Blue, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Opaque

• Habit: Hexagonal prismatic

• Cleavage: Imperfect on {0001} (1 plane)
• Hardness: 7.5-8
• Density: 2.7

• System: Hexagonal
• Group: 6/mmm, P6/mcc
• Lattice: a=9.2, c=9.2

Etymology: Beryllus in Latin but original mineral is not known.