Mineral - Emerald

Name Emerald
Class Semi-precious
Category Beryl
Crystal system Hexagonal
Chemical composition Aluminum and beryllium silicate (Be₃Al₂Si₆O₁₈) with traces of chromium and/or vanadium
Hardness (Mohs scale) 7.5 to 8
Transparency Translucent to transparent
Geographical origin Colombia, Brazil, Zambia, Afghanistan, Russia, Madagascar