Tag Archive for gemini birthstone

Gemini Birthstone – Emerald

emerald

previous sign calendar months(May 22 – June 21) next sign Emerald fact file Crystal Structure: hexagonal Chemical Composition: Beryl – silicate of Beryllium and Aluminum Al2Be3(Si6O18) Hardness: 7.5 to 8 MOHS Refractive Index: 1.57 to 1.60 Colors: light to dark…