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" ... If you were lucky enough to be born in the month of October, your birthstone is both tourmaline and opal. Tourmaline comes from the Sinhalese word for mixed colored stone, tura mali. In fact, tourmaline is not a single mineral, it is a group of minerals that have very different chemical compositions and colors. A tourmaline is a boron silicate mineral that occur within igneous and metamorphic rocks. ... "