| Front | tourmaline |
|---|---|
| Back | tourmaline [ˈtuəməˌli:n] n 电气石，碧玺 any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery |
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