Engelsk substantiv: tourmaline | |||
1. | tourmaline (om masse eller substans) a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones | ||
Mindre spesifikke uttrykk | mineral, transparent gem | ||
Mere spesifikke uttrykk | schorl | ||