noun tour·ma·line \ˈtu̇r-mə-lən, -ˌlēn\

Definition of tourmaline

  1. :  a mineral of variable color that consists of a complex borosilicate and is valued as a gem when transparent and cut

Origin and Etymology of tourmaline

Sinhalese toramalli carnelian

First Known Use: 1759

Other Mineralogy Terms

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