less value is attached to semiprecious stones such as garnets, opal, topazes, and tourmalines.
半宝石价值较低，如石榴石，蛋白石，黄玉和电气石。
Semiprecious gemstones, tourmalines belong to a family of borosilicate minerals.
准宝石的宝石，电气石属于一个家族的硼硅酸盐矿物。
Mineralogical Features and Genetic Significance of Tourmalines from Boron Deposits in Eastern Liaoning
辽东硼矿床中电气石的矿物学特征及成因意义
The natural tourmalines' color is diversity and its genesis is complexity.
天然电气石颜色多种多样，颜色成因非常复杂。
Cutting tourmalines requires a good deal of patience and plenty of experience too.
切割碧玺晶体须要极大的耐心与许多的经验。
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