Tourmaline

(noun.) 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.

丹尼尔编辑

• Of these minerals, beryl, garnet and tourmaline are the most abundant. 佚名. 神奇的知识之书.

编辑:瑞伊