Engelsk navneord: tourmaline | |||
1. | tourmaline (om masse el. 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 specifikke termer | mineral, transparent gem | ||
Mere specifikke termer | schorl | ||