a transparent to translucent glassy mineral,essentially aluminum beryllium silicate,Be3Al2Si6O18,occurring in hexagonal prisms and constituting the chief source of beryllium. Transparent varieties in white,green,blue,yellow,or pink are valued as gems

• 绿玉，一种透明到半透明的玻璃状矿石，主要成分为硅酸铝铍，Be3Al2Si6O18，呈六棱柱结构，是铍的主要来源。各种透明的白色、绿色、蓝色、黄色或粉色绿玉与宝石价值相当