TOURMALINE

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

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

Classified under:

Nouns denoting substances

Hypernyms ("tourmaline" is a kind of...):

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

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

Hyponyms (each of the following is a kind of "tourmaline"):

schorl (black tourmaline)

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