tourmaline

Other Definitions
tourmaline (enc)

Noun

tourmaline - 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

mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition

schorl - black tourmaline

transparent gem - a gemstone having the property of transmitting light without serious diffusion

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