| / English Dictionary |
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:
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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